Unable to mute reverb @ Ubuntu

[kompik2]

Dear Mark,

I'm trying to use NRPN to control the system effects, have added echo as a first and reverb as a second. Sending these:

B0 63 04 // Select the system effects
B0 62 01 // Select the second effect
B0 06 00 // Select the effect parameter 00
B0 26 7F // Change the parameter of effect to the value 7F (127)

and it changes ok. However I expect if I send B0 26 00 as last line - this will mute reverb. But not the case - it still works at some minimum level. Same with echo. So the question, is this the normal functionality? Is it possible to turn off effect somehow via midi?

Best,
Ihor.

[fundamental]

This appears to be an issue that affects multiple effect types.

For a system-effect reverb instance the volume is calculated at:
https://github.com/zynaddsubfx/zynaddsu ... b.cpp#L218

This puts the output multiplier logarithmically between 1e-8 and 1.0 with different volume settings.

Until this bug is corrected the best way to mute a system effect reverb would be to change it's volume in the system effect routing interface. This can be done through MIDI using the MIDI learn interface, but not through the normal NRPN interface.