use sqrt(event.velocity) for the dynamic expander to get a MIDI curve which matches the ones of edrum modules

1 files changed, 8 insertions, 13 deletions

diff --git a/src/inputprocessor.cc b/src/inputprocessor.cc
index 8481684..9822daf 100644
--- a/src/inputprocessor.cc
+++ b/src/inputprocessor.cc
@@ -294,21 +294,16 @@ bool InputProcessor::processOnset(event_t& event, std::size_t pos,
 // TEST dynamic expander
 //printf("event_sample.scale: %f, event.velocity: %f, sample->getPower(): %f, instr->getMinPower(): %f, instr->getMaxPower(): %f\n", event_sample.scale, event.velocity, sample->getPower(), instr->getMinPower(), instr->getMaxPower());
 
-auto instr_dynamic = 10 * log10(instr->getMaxPower()) - 10 * log10(instr->getMinPower());
-auto sel_power     = 10 * log10(sample->getPower());
+auto target_max_power_db = 10 * log10(instr->getMaxPower());
+auto target_min_power_db = 10 * log10(instr->getMinPower());
+auto sel_power_db        = 10 * log10(sample->getPower());
+auto target_dynamic_db   = 35.0; // dB
 
-auto target_dynamic   = 35.0; // dB
-auto target_max_power = 10 * log10(instr->getMaxPower());
-auto target_min_power = target_max_power - target_dynamic;
-
-auto target_power = event.velocity * target_dynamic - target_dynamic + target_max_power;
-
-auto diff_power = target_power - sel_power;
-
-event_sample.scale = pow(10.0, diff_power / 20);
-
-//printf("event_sample.scale: %f, diff_power: %f, target_power: %f, sel_power: %f\n", event_sample.scale, diff_power, target_power, sel_power);
+auto target_power_db = sqrt(event.velocity) * target_dynamic_db + target_max_power_db - target_dynamic_db;
+auto diff_power_db   = target_power_db - sel_power_db;
+event_sample.scale   = pow(10.0, diff_power_db / 20);
 
+//printf("event_sample.scale: %f, diff_power_db: %f, target_power_db: %f, sel_power_db: %f\n", event_sample.scale, diff_power_db, target_power_db, sel_power_db);
 
 		}
 	}