[sdiy] MIDI CC with Pots

Richie Burnett rburnett at richieburnett.co.uk
Sun Oct 5 20:43:30 CEST 2014

On a related note, how are people dealing with the MIDI loop problem these 
days when tweaking real-time controllers and recording to their sequencer?

To use Paul's example of a bassline playing over 2 bars and someone tweaking 
the "filter cutoff" control on a synth...  This manipulation of the control 
will change the filter setting directly inside the synth, but will also 
result in CC messages being sent out the synth's MIDI OUT port to the 
sequencer for recording.  The sequencer then feeds these CC messages back 
out it's MIDI OUT port and they arrive back at the synth's MIDI IN port, 
where they presumably get acted on and set the filter cutoff frequency 
inside the synth again!

In this situation is it usual to:

1. Ignore the problem while recording (it'll be fine during playback 
2. Turn off looping-through of MIDI messages at the sequencer
3. Turn off "local control" at the synth so it only acts on the CC messages 
after they've been sent out to the sequencer and come back via the MIDI IN 

How important is it to provide a "local off" option in the menu of pieces of 
MIDI kit these days to circumvent this problem?


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