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Author Topic: Unwanted harmonics with CS-80 filters  (Read 2071 times)

Patrice

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Unwanted harmonics with CS-80 filters
« on: February 13, 2010, 05:00:20 pm »
When using two CS-80 Filters (as in a real CS-80), ugly harmonics appear at higher frequencies.

To observe it, put in a row:

KBF > CS-80  osc (SQUARE) > cs-80 flt (HP) > cs-80 flt (LP) > Out

Play high keys, one after the other. Try in particular: G5, Bb6, Eb6

The issue is bound to the CS-80 filters. With a couple of Origin or Jupiter8 filters the result is much acceptable: the sound is cleaner (With two Jupiter 8 filters, unwanted harmonics appear only about A8). If you mix a CS-80 filter with one of an other kind, uggly harmonics come back.

Setting the HPF before the LPF reduces the problem a little bit.

I tried to tweak the TAE amount of the program just to see (or should I say, to hear) if it could reduce the unwanted harmonics. But the more TAE I add, the worst it is! The sound is best when TAE amount is set to 0.  ???

In comparison, on the CS-80V2, switching on the low pass filter (left wide open) adds some noise. But that's very faint and as no harmonic stands out, this is no real problem.

So I have two questions:

1. (When) should we use TAE Amount?

2. Can we expect an improvement of the CS-80 filter's behaviour in high frequencies by the availability of the CS-80 template?

Philippe

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Re: Unwanted harmonics with CS-80 filters
« Reply #1 on: February 15, 2010, 09:17:28 am »
I've added this to the bug data base. We'll fix it asap.
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