244 lines
13 KiB
HTML
244 lines
13 KiB
HTML
---
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layout: default
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title: OSC: Feedback
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---
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<p>
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Feedback from the Ardour to the the control surface is very useful for
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a number of things. Motor faders need to know where the the track
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they have been attached to is at before they were assigned otherwise
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the DAW fader will jump to where the controller fader is. Likewise,
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the buttons on each strip need to know what their value is so they can
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light their LED correctly. Transport controls should let you know if
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they are active too. This is what feedback is all about.
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</p>
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<p>
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Ardour does feedback by sending the same path back that is used to
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control the same function. As such any controls that have feedback
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have a parameter that is the value of the control or it's state
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(on or off). In the case of OSC paths listed on the main OSC page
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as having no parameter, if they have feedback, they will also work
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with a 1 for button press and 0 for button release. This is because
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many OSC controllers will only use exactly the same path for feedback
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as for control. For example:
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</p>
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<dl class="bindings">
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<dt><kbd class="osc">/transport_stop</kbd></dt>
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<dd></dd>
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</dl>
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<p>can be used also in the form:</p>
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<dl class="bindings">
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<dt><kbd class="osc">/transport_stop <em>press</em></kbd></dt>
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<dd>where <em>press</em> is an int/bool indicating if the button is pressed or not.</dd>
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</dl>
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<p>
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The feedback does not have the same meaning as the control message.
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Where the button release sent to Ardour will be ignored and has no
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meaning. Both states have meaning in feedback to the controller.
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The feedback will be:
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</p>
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<dl class="bindings">
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<dt><kbd class="osc">/transport_stop <em>state</em></kbd></dt>
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<dd>where <em>state</em> is an int/bool indicating if the transport is stopped or not.</dd>
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</dl>
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<p>
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With feedback turned on, OSC control commands that try to change a
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control that does not exist will get feedback that resets that control
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to off. For example, sending a /strip/recenable to a buss will not work
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and Ardour will try to turn the controller LED off in that case. Also
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note that Pan operation may be limited by pan width in some cases.
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That is with pan width at 100% (or -100%) there is no pan position
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movement available.
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</p>
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<p>
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It may come as a surprise, but feedback often generates more network
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traffic than control itself does. Some things are more obvious like
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head position or meters. But even a simple button push like transport
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start sends not only a signal to turn on the play LED, but also one to
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turn off the stop LED, the Rewind LED, the Fast Forward LED and the
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Loop LED. That is still minor, think instead of a surface refresh
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such as happens when the surface is first connected and then most of
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that happens every time the fader strips are banked. This is why
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feedback is enabled in sections so that as little feedback as is
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actually needed is sent. This is also a consideration if the surface
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is connected via wifi.
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</p>
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<h2>List of OSC feedback messages</h2>
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<h3>Feedback only</h3>
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<p>
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These messages are feedback only. They are sent as status from Ardour
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and some of them may be enabled separately from other feedback. See:
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<a href="/using-control-surfaces/controlling-ardour-with-osc/calculating-feedback-and-strip-types-values/">
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Calculating Feedback and Strip-types Values.</a>
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</p>
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<p class="note">
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See strip section below for info about ssid and wrapping it into the
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path. Also /master and /monitor support what the /strip does.
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</p>
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<p>
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In the case where Gainmode is set to position, the track name will
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show the dB value while values are changing.
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</p>
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<dl class="bindings">
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<dt><kbd class="osc">/strip/name <em>ssid</em> <em>track_name</em></kbd></dt>
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<dd>where <em>track_name</em> is a string representing the name of the track</dd>
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<dt><kbd class="osc">/session_name <em>session_name</em></kbd></dt>
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<dd>where <em>session_name</em> is a string representing the name of the session</dd>
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<dt><kbd class="osc">/strip/meter <em>ssid</em> <em>meter</em></kbd></dt>
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<dd>where <em>meter</em> is a value repesenting the current audio level.
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(the exact math used is determined by the feedback bits set)</dd>
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<dt><kbd class="osc">/strip/signal <em>ssid</em> <em>signal</em></kbd></dt>
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<dd>where <em>signal</em> is a float indicating the instantaneous
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audio level is -40dB or higher.</dd>
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<dt><kbd class="osc">/position/smpte <em>time</em></kbd></dt>
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<dd>where <em>time</em> is a string with the current play head time. Seconds as per smpte.</dd>
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<dt><kbd class="osc">/position/bbt <em>beat</em></kbd></dt>
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<dd>where <em>beat</em> is a string with the current play head bar/beat.</dd>
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<dt><kbd class="osc">/position/time <em>time</em></kbd></dt>
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<dd>where <em>time</em> is a string with the current play head time. Seconds are in milliseconds</dd>
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<dt><kbd class="osc">/position/samples <em>samples</em></kbd></dt>
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<dd>where <em>samples</em> is a string with the current play head position in samples.</dd>
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<dt><kbd class="osc">/heartbeat <em>LED</em></kbd></dt>
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<dd>where <em>LED</em> is a float that cycles 1/0 at 1 second intervals.</dd>
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<dt><kbd class="osc">/record_tally <em>state</em></kbd></dt>
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<dd>Some record enable is true or "ready to record". For a "Recording" sign at studio door.</dd>
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</dl>
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<h3>Transport Control</h3>
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<dl class="bindings">
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<dt><kbd class="osc">/transport_stop <em>state</em></kbd></dt>
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<dd><em>state</em> is true when transport is stopped</dd>
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<dt><kbd class="osc">/transport_play <em>state</em></kbd></dt>
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<dd><em>state</em> is true when transport speed is 1.0</dd>
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<dt><kbd class="osc">/ffwd <em>state</em></kbd></dt>
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<dd><em>state</em> is true when transport is moving forward but not at speed 1.0</dd>
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<dt><kbd class="osc">/rewind <em>state</em></kbd></dt>
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<dd><em>state</em> is true when transport speed is less than 0.0</dd>
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<dt><kbd class="osc">/loop_toggle <em>state</em></kbd></dt>
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<dd><em>state</em> is true when loop mode is true</dd>
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<dt><kbd class="osc">/cancel_all_solos <em>state</em></kbd></dt>
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<dd>Where <em>state</em> true indicates there are active solos that can be canceled.</dd>
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</dl>
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<h3>Recording control</h3>
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<dl class="bindings">
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<!--dt><kbd class="osc">/toggle_punch_in</kbd></dt>
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<dd></dd>
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<dt><kbd class="osc">/toggle_punch_out</kbd></dt>
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<dd></dd-->
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<dt><kbd class="osc">/rec_enable_toggle <em>state</em></kbd></dt>
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<dd>Master record enabled.</dd>
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</dl>
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<h3>Master and monitor strips</h3>
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<p>
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Master and monitor strips are similar to track strips but do not use
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the SSID. Rather they use their name as part of the path:
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</p>
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<dl class="bindings">
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<dt><kbd class="osc">/master/gain <em>dB</em></kbd></dt>
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<dd>where <em>dB</em> is a float ranging from -193 to +6 representing the actual gain of master in dB</dd>
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<dt><kbd class="osc">/master/fader <em>position</em></kbd></dt>
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<dd>where <em>position</em> is an int ranging from 0 to 1023 representing the fader control position</dd>
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<dt><kbd class="osc">/master/trimdB <em>dB</em></kbd></dt>
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<dd>where <em>dB</em> is a float ranging from -20 to +20 representing the actual trim for master in dB</dd>
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<dt><kbd class="osc">/master/pan_stereo_position <em>position</em></kbd></dt>
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<dd>where <em>position</em> is a float ranging from 0 to 1 representing the actual pan position for master</dd>
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<dt><kbd class="osc">/master/mute <em>yn</em></kbd></dt>
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<dd>where <em>yn</em> is a bool/int representing the actual mute state of the Master strip</dd>
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<dt><kbd class="osc">/monitor/gain <em>dB</em></kbd></dt>
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<dd>where <em>dB</em> is a float ranging from -193 to 6 representing the actual gain of monitor in dB</dd>
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<dt><kbd class="osc">/monitor/fader <em>position</em></kbd></dt>
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<dd>where <em>position</em> is an int ranging from 0 to 1023 representing the fader control position</dd>
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</dl>
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<h3>Track specific operations</h3>
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<p>
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For each of the following, <em>ssid</em> is the surface strip ID for the track
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</p>
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<p class="note">
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Some Surfaces (many Android applets) are not able to deal with more
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than one parameter in a command. However, the two parameter commands
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below can also be sent as /strip/command/ssid param. Feedback can be
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set to match this with the /set_surface/feedback <em>state</em>
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command. See <a
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href="/using-control-surfaces/controlling-ardour-with-osc/calculating-feedback-and-strip-types-values/">
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Calculating Feedback and Strip-types Values.</a>
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</p>
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<dl class="bindings">
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<dt><kbd class="osc">/bank_up <em>LED</em></kbd></dt>
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<dd>where <em>LED</em> is a bool that indicates another bank_up operation is possible.</dd>
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<dt><kbd class="osc">/bank_down <em>LED</em></kbd></dt>
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<dd>where <em>LED</em> is a bool that indicates another bank_down operation is possible.</dd>
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<dt><kbd class="osc">/strip/name <em>ssid</em> <em>track_name</em></kbd></dt>
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<dd>where <em>track_name</em> is a string representing the name of the track
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(note there is no coresponding command to set the track name)</dd>
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<dt><kbd class="osc">/strip/mute <em>ssid</em> <em>mute_st</em></kbd></dt>
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<dd>where <em>mute_st</em> is a bool/int representing the actual mute state of the track</dd>
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<dt><kbd class="osc">/strip/solo <em>ssid</em> <em>solo_st</em></kbd></dt>
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<dd>where <em>solo_st</em> is a bool/int representing the actual solo state of the track</dd>
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<dt><kbd class="osc">/strip/monitor_input <em>ssid</em> <em>monitor_st</em></kbd></dt>
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<dd>where <em>monitor_st</em> is a bool/int. True/1 meaning the track is force to monitor input</dd>
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<dt><kbd class="osc">/strip/monitor_disk <em>ssid</em> <em>monitor_st</em></kbd></dt>
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<dd>where <em>monitor_st</em> is a bool/int. True/1 meaning the track is force to monitor disk,
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where both disk and input are false/0, auto monitoring is used.</dd>
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<dt><kbd class="osc">/strip/recenable <em>ssid</em> <em>rec_st</em></kbd></dt>
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<dd>where <em>rec_st</em> is a bool/int representing the actual rec state of the track</dd>
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<dt><kbd class="osc">/strip/record_safe <em>ssid</em> <em>rec_st</em></kbd></dt>
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<dd>where <em>rec_st</em> is a bool/int representing the actual record safe state of the track</dd>
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<dt><kbd class="osc">/strip/gain <em>ssid</em> <em>gain</em></kbd></dt>
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<dd>where <em>gain</em> is a float ranging from -193 to 6 representing the actual gain of the track in dB.</dd>
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<dt><kbd class="osc">/strip/fader <em>ssid</em> <em>position</em></kbd></dt>
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<dd>where <em>position</em> is an float ranging from 0 to 1 representing the actual fader position of the track.</dd>
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<dt><kbd class="osc">/strip/trimdB <em>ssid</em> <em>trim_db</em></kbd></dt>
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<dd>where <em>trim_db</em> is a float ranging from -20 to 20 representing the actual trim of the track in dB.</dd>
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<dt><kbd class="osc">/strip/pan_stereo_position <em>ssid</em> <em>position</em></kbd></dt>
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<dd>where <em>position</em> is a float ranging from 0 to 1 representing the actual pan position of the track</dd>
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</dl>
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<h3>Selection Operations</h3>
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<p>
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Selection feedback is the same as for strips, only the path changes
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from <em>/strip</em> to <em>/select</em> and there is no <em>ssid</em>.
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there are some extra feedback and commands that will be listed here.
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</p>
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<dl class="bindings">
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<dt><kbd class="osc">/select/n_inputs <em>number</em></kbd></dt>
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<dd>where <em>number</em> number of inputs for this strip</dd>
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<dt><kbd class="osc">/select/n_outputs <em>number</em></kbd></dt>
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<dd>where <em>number</em> number of outputs for this strip</dd>
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<dt><kbd class="osc">/select/comment <em>text</em></kbd></dt>
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<dd>where <em>text</em> is the strip comment</dd>
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<dt><kbd class="osc">/select/solo_iso <em>state</em></kbd></dt>
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<dd>where <em>state</em> is a bool/int representing the Actual solo isolate state of the track</dd>
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<dt><kbd class="osc">/select/solo_safe <em>state</em></kbd></dt>
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<dd>where <em>state</em> is a bool/int representing the actual solo safe/lock state of the track</dd>
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<dt><kbd class="osc">/select/polarity <em>invert</em></kbd></dt>
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<dd>where <em>invert</em> is a bool/int representing the actual polarity of the track</dd>
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<dt><kbd class="osc">/select/pan_stereo_width <em>width</em></kbd></dt>
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<dd>where <em>width</em> is a float ranging from 0 to 1 representing the actual pan width of the track</dd>
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<dt><kbd class="osc">/select/send_gain", <em>sendid</em> <em>send_gain</em></kbd></dt>
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<dd>where <em>sendid</em> = nth_send, <em>send_gain</em>is a float
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ranging from -193 to +6 representing the actual gain in dB for the send</dd>
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<dt><kbd class="osc">/select/send_fader", <em>sendid</em> <em>send_gain</em></kbd></dt>
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<dd>where <em>sendid</em> = nth_send, <em>send_gain</em>is a float
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ranging from 0 to 1 representing the actual position for the send as a fader</dd>
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<dt><kbd class="osc">/select/send_name <em>sendid</em> <em>send_name</em></kbd></dt>
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<dd>where <em>send_name</em> is a string representing the name of the buss
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this send goes to.</dd>
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</dl>
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<h3>Menu actions</h3>
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<p>
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Every single menu item in Ardour's GUI is accessible via OSC. However,
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there is no provision for returning the state of anything set this way.
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This is not a bad thing as most menu items either do not have an on/off
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state or that state is quite visible. Binding that affect other parameters
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that OSC does track will show on those OSC controls. Examples of this
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might be track record enable for tracks 1 to 32, play or stop.
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</p>
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