<div dir="auto">Audio mixing takes signals of very different input levels and set them to quite different output levels. A huge gain range is needed.<div dir="auto"><br></div><div dir="auto">Synth waveform mixers, on the other hand, take signals of a well-known and constant amplitude and very often set them to almost the same amplitude into a filter. A small gain range is needed, and it's even good to have the higher gains taking up most of the potentiometer range.</div><div dir="auto"><br></div><div dir="auto">I guess that's why they differ in this regard. :-)</div><div dir="auto"><br></div><div dir="auto">/mr</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">Den 5 okt. 2017 11:16 em skrev "Richie Burnett" <<a href="mailto:rburnett@richieburnett.co.uk">rburnett@richieburnett.co.uk</a>>:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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!<br>
<br>
-Richie,<br>
<br>
<br>
<br>
-----Original Message----- From: Tom Wiltshire<br>
Sent: Thursday, October 05, 2017 9:29 PM<br>
To: *SYNTH DIY<br>
Subject: [sdiy] Waveform/source mixers in classic polysynths<br>
<br>
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.<br>
<br>
However, many polysynths have a waveform or oscillator/noise source mixer which usually uses linear control. Is there any reason for this?<br>
<br>
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?<br>
<br>
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?<br>
<br>
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.<br>
<br>
Thanks,<br>
Tom<br>
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