Two main problems are addressed by this commit.
First, storage of
parameters was broken because the index for values was set by the
parameter count, not the control port count which set_processor_param()
expects.
Second, the value was not clamped to pd.upper and pd.lower causing some
parameters to fail when set.
This invalidates previous mixer store files.
This reverts commit 8702ff2189,
and b10d9cf09b.
There was a misconception on the iterator (port vs message
in sequence), besides Ardour's mixer-strip is preferably used
with a single MIDI port. Most plugin-standards also only support
one port.
If need be LuaDSP run_map() can be used to handle multiple
MIDI I/O ports already.
