[sdiy] MIDI CC with Pots

Adam Inglis 21pointy at tpg.com.au
Tue Oct 7 00:57:10 CEST 2014

On 07/10/2014, at 1:17 AM, rburnett at richieburnett.co.uk wrote:
> The synth doesn't send out the CC again.  The synth processes the  
> control change due to it's internal local connection between the  
> control that was turned and the synth engine, and sends out a CC so  
> that the tweak can be recorded, but the sequencer then re-transmits  
> this CC message back out of its MIDI out port so that it ends up  
> arriving back at the synth via it's MIDI IN port to possibly get  
> processed again.

And if you are using data increment and decrement, every value change  
of 1 will end up being 2. This happens on my (Robin Whittle modified)  
"Local off" would probably be easier than fiddling with sequencer  
settings that may require some menu diving.


> This is the situation I was discussing.  And whether "local off" at  
> the synth or dissabling thru functionality at the sequencer were the  
> preferred way to deal with this?  Or indeed whether people even  
> worry about it?
> -Richie,
> On 2014-10-06 16:06, Paul Maddox wrote:
>> Richie,
>>> 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!
>> errr, why?
>> Sorry, most synths I know when they receive a CC don't send it "out"
>> again, only to the 'thru' port.
>> Paul
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