I need help with making a crossfader in midi designer

Question

Hi im working in AUM app for ipad where i want to be able to crossfade between two channels/tracks. I understand that i need to send a negative value (volume of course) at thesame time i send a positive to the other track. In midi designer i found a crossfader but cant set it to positive/negative. Only 0-127 or relative 0-1.

Any idea on how i should proceed?

Best from Sweden

Peppe

Answer 1

Crossfader may be a misnomer, it is just a fader turned sideways.  And it only sends one MIDI value.  But it prolly is still the place to start, since as a supercontrol it can cross fade between multiple values.

Make two individual controls that adjust the two separate volumes (usually Cc 7, sometimes Cc 11, appropriate MIDI channel).  Reverse the MIDI range on one of the controls (127-0).  Test and see if they work properly.

Add a crossfader, and make it a supercontrol of the two controls above.  The two subcontrols can be hidden in play mode at this point.

(While it doesn't apply here, MIDI does not have negative values, it just goes 0-127, or 0-16383.  It depends on the device how this range is used to indicate negative values when needed - there are several different approaches possible.)

Answer 2

Crossfader may be a misnomer, it is just a fader turned sideways.  And it only sends one MIDI value.  But it prolly is still the place to start, since as a supercontrol it can cross fade between multiple values.

Make two individual controls that adjust the two separate volumes (usually Cc 7, sometimes Cc 11, appropriate MIDI channel).  Reverse the MIDI range on one of the controls (127-0).  Test and see if they work properly.

Add a crossfader, and make it a supercontrol of the two controls above.  The two subcontrols can be hidden in play mode at this point.

(While it doesn't apply here, MIDI does not have negative values, it just goes 0-127, or 0-16383.  It depends on the device how this range is used to indicate negative values when needed - there are several different approaches possible.)