[sdiy] Polyphonic temp compensation in VCF's!

[Harry Bissell]

The Prophet V auto tunes the filter by setting the resonance to self-oscillation
and then measuring the frequencies, and making an interpolation table at several points.

don't know about the rest...


----- Original Message -----
From: karl dalen <dalenkarl at yahoo.se>
To: Tom Wiltshire <tom at electricdruid.net>
Cc: synth-diy at dropmix.xs4all.nl
Sent: Mon, 23 May 2011 18:37:33 -0400 (EDT)
Subject: Re: [sdiy] Polyphonic temp compensation in VCF's!

-- Den mån 2011-05-23 skrev Tom Wiltshire <tom at electricdruid.net>:

> 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.

The autotune in those machines as i have understod them
are probably multi pass all parameter tuning method, not
continuous background single parameter periodical tuning
method (compare with A6) which would make sense. If that
actually works? Anyhow, in many cases are slow on the
8Mhz Z80 of the day.

So slam the auto button dont seem like a viable method
to me, well if it would they should have not put in
tempcos in the first place i reasoning.

OBmx are a resonable new design has no tempcos but FFM
it would have been interesting to se how auto tuning
works on the 2 discrete filters.
 
KD

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-- 
Harry Bissell & Nora Abdullah 4eva