[sdiy] Polyphonic temp compensation in VCF's!

[Tom Wiltshire]

On 23 May 2011, at 02:09, karl dalen wrote:

> A diversity among the old.
> 
> Many who do not have FFM do have tempcos. JP8, MM,OB8 etc.
> Many who do have FFM do not have tempcos. M6,M1000,P08 Sixtrak,P5 etc
> Some oddballs do have FFM and tempcos. ARP Chroma.
> 
> Example Matrix6 +3000 to +3600ppm no tempco
> yet FFM and no user ever complained!....
> Cant hear the modulation index differences per semi note... or?
> 
> Your idea on polysynth, should VCF go with or
> without tempcos whether or not FFM are designed in?
> 
> KD

Many of the synths you mention that *don't* have tempcos for the filter will use an autotune routine instead. So if you think the filter FM sounds 'out of tune', you can just bang the autotune button - at whatever temperature.

This looks like cost saving to me. Much cheaper to compensate for the errors in software than try and trim them out in hardware.

HTH,
T.