[sdiy] LFO range as equal tempered pitch modifier

[ASSI]

On Wednesday 21 July 2010, MTG wrote:
> I have never really played with using an LFO as a "sequencer"
> before (see: http://www.scoreforsale.com/html/lfo_drum_video.html
> ). But it makes sense to me that one might want to hit thirds,
> fifths, whatever ... and not just octaves (or conversely not just
> narrow warbles).  127 steps is not a huge resolution to do it in,
> but I figure if I reduce my overall range somewhat, I can scale
> the LFO depth (step size) to hit semitones, half-semitones,
> quarter, third or what have you.

If you want to stick with the 128 values provided via MIDI CC without 
sacrificing range and if you have some memory left over, you could 
provide a lookup table that maps MIDI CC to LFO depth (and perhaps 
provide for exchanging the lookup table via sysex).  If you have less 
memory, the same thing (but less flexibly) can be done via a suitable 
mapping function that lands on suitable musical intervals or a 
combination of lookup table and mapping function.


Achim.
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