Two synths (two channels) may me
managed with one instance of Prognum.
The second processing tract (shown
in red numbers) features responsibility to the
program-changing button on all channels - while
sending the resulting MIDI program change message to
the chosen (destination) channel only. So user does
not have to switch the MIDI keyboard to the second
MIDI channel to send a program change to the second
synth (e.g. a groovebox).