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Bc2000 (for the BCF2000 & BCR2000)

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Re: Question for Royce re parameter feedback

2013-07-07 by Royce

Hi Steve

> IIRC ANX also responds to XG and NRPNs.

Excellent 

> I didn't follow what you meant by global mode.
Hold EDIT and press STORE and you are in Global Edit mode. Any changes here effect all presets.

There is a parameter  '.txinterval' that has value of 2,5,10,20, 50, or 100 in mSec. The BC waits this length of time before outputting a Midi message of the value.

If there is further change before this time has elapsed then the clock is set back to 0 and the BC waits for another txinterval. 

So if you are swinging about on an encoder the amount of Midi data is reduced, but at the cost of responsiveness (but not noticeable enough for me not to use it in performance although you need to select the smallest value that meets you needs).
 
The other problem is that values can jump rather than step and produce 'zipper noise' due to a high value of txinterval. So it is a question of trading off one for the other. 
 
> 
> I have made parameter feedback for Miniak using an embedded processor to handle some issues _ particularly the PGM change issue. I had to keep a master state and decide whether to send 434 bytes for full PGM or just changes. Alas for some controls you have yo send all else symth ignores them ... Bug on AKAI end. I can do this easily with PC but wanted to avoid real computers if at all possible.
> 
> The additional benefit is I could create LCD output of the params.
Sounds like you built a 'real computer' 8)

> One thing regarding full state feedback. I found some manufactures handle this by jumping (no coupling). Some by blending (on alg is only when param value matches knob value will remote control take over ... I guess because they are pots rather than endless encoders). The full feedback can be chatty.

Yes, but you can alter this for the preferred style in the software if you are building one program or piece of hardware for each synth.

You don't get this luxury in a general program.

> > The Roland XVs, Fantoms, SonicCell and the Yamaha Motif XS (didn't check my Motif ES rack) can all change in real ltime via sysex. Filter frequency sweeps on held note work perfectly well.

Further investigation reveals that some of the parameters in the Motif XS, like the LFO don't do a real time change unless you attach a CC modulation in the patch.
So you have to live with the limitations.  

DSPs are getting faster, but each synth model is a snapshot of the technology that was available. 
Perhaps the Motif XF doesn't have this limitation.

Royce

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