[sdiy] Odp: Re: Waveform/source mixers in classic polysynths

[Roman]

Since all signals in such mixer are strongly corelated, or let's dare to say this is one signal with differently shaped spectrum, there's no point in wide range of attenuation. Whatever you mix it still sounds like one oscillator, only changing timbre. So it's difficult to tell if one waveform component is only 15dB lower or muted. Hence no need for long pot travel in higher attenuation area that log/audio pot provides.   Roman  Dnia 5 października 2017 23:19 Richie Burnett <rburnett at richieburnett.co.uk> napisał(a):  I've noticed this too Tom, and am interested to hear people's comments.  I  have no idea why linear pots are used in synths to mix oscillator volumes  instead of the more usual log taper for audio mixing!   -Richie,     -----Original Message-----  From: Tom Wiltshire  Sent: Thursday, October 05, 2017 9:29 PM  To: *SYNTH DIY  Subject: [sdiy] Waveform/source mixers in classic polysynths   The accepted wisdom is that audio mixers should use a log response rather  than linear response. Audio mixers are usually equipped with log pots for  this reason.   However, many polysynths have a waveform or oscillator/noise source mixer  which usually uses linear control. Is there any reason for this?   Is it just that it was simplest when the obvious VCA to control a source’s  level ahead of the filter was based on an OTA, which has a linear response?   Are there any examples of classic synths where this is *not* the case, and  the waveform/source mixing is done with an audio/log response?   Background: I’ve been looking at old schematics again, for the Prophet 5  (learning from the masters!). I suppose there’s an outside chance they did a  Lin/log conversion in the software before they sent the CV out, but I  seriously doubt it.   Thanks,  Tom   ==================       Electric Druid  Synth & Stompbox DIY  ==================    ______________________________  Synth-diy mailing list   Synth-diy at synth-diy.org  synth-diy.org synth-diy.org    ---  This email has been checked for viruses by AVG.  www.avg.com www.avg.com   ______________________________  Synth-diy mailing list   Synth-diy at synth-diy.org  synth-diy.org synth-diy.org
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