diff --git a/libs/ardour/amp.cc b/libs/ardour/amp.cc
index fdb7921184..0bad76ee08 100644
--- a/libs/ardour/amp.cc
+++ b/libs/ardour/amp.cc
@@ -72,13 +72,6 @@ Amp::configure_io (ChanCount in, ChanCount out)
 	return Processor::configure_io (in, out);
 }
 
-static void
-scale_midi_velocity(Evoral::Event<MidiBuffer::TimeType>& ev, float factor)
-{
-	factor = std::max(factor, 0.0f);
-	ev.set_velocity(std::min(127L, lrintf(ev.velocity() * factor)));
-}
-
 void
 Amp::run (BufferSet& bufs, samplepos_t /*start_sample*/, samplepos_t /*end_sample*/, double /*speed*/, pframes_t nframes, bool)
 {
@@ -103,7 +96,7 @@ Amp::run (BufferSet& bufs, samplepos_t /*start_sample*/, samplepos_t /*end_sampl
 					Evoral::Event<MidiBuffer::TimeType> ev = *m;
 					if (ev.is_note_on()) {
 						assert(ev.time() >= 0 && ev.time() < nframes);
-						scale_midi_velocity (ev, fabsf (gab[ev.time()]));
+						ev.scale_velocity (fabsf (gab[ev.time()]));
 					}
 				}
 			}
@@ -222,7 +215,7 @@ Amp::apply_gain (BufferSet& bufs, samplecnt_t sample_rate, samplecnt_t nframes,
 						m = mb.erase (m);
 						continue;
 					} else if (ev.is_note_on()) {
-						scale_midi_velocity (ev, scale);
+						ev.scale_velocity (scale);
 					}
 				}
 				++m;
@@ -306,7 +299,7 @@ Amp::apply_simple_gain (BufferSet& bufs, samplecnt_t nframes, gain_t target, boo
 				for (MidiBuffer::iterator m = mb.begin(); m != mb.end(); ++m) {
 					Evoral::Event<MidiBuffer::TimeType> ev = *m;
 					if (ev.is_note_on()) {
-						scale_midi_velocity(ev, fabsf (target));
+						ev.scale_velocity (fabsf (target));
 					}
 				}
 			}
diff --git a/libs/evoral/evoral/Event.h b/libs/evoral/evoral/Event.h
index 43a60c3a02..b4957c4d5b 100644
--- a/libs/evoral/evoral/Event.h
+++ b/libs/evoral/evoral/Event.h
@@ -23,8 +23,10 @@
 #ifndef EVORAL_EVENT_HPP
 #define EVORAL_EVENT_HPP
 
+#include <algorithm>
 #include <cstdlib>
 #include <cstring>
+#include <cmath>
 #include <sstream>
 #include <stdint.h>
 
@@ -179,6 +181,11 @@ public:
 	void set_cc_value(uint8_t val)     { _buf[2] = val; }
 	void set_pgm_number(uint8_t num)   { _buf[1] = num; }
 
+	void scale_velocity (float factor) {
+		factor = std::max (factor, 0.0f);
+		set_velocity (std::min (127L, lrintf (velocity() * factor)));
+	}
+
 	uint16_t value() const {
 		switch (type()) {
 		case MIDI_CMD_CONTROL: