[sdiy] Additive/Subtractive synthesis?

[Richard Wentk]

At 16:52 28/04/2003 +0200, Magnus Danielson wrote:
>From: Ingo Debus <debus at cityweb.de>
>Subject: Re: [sdiy] Additive/Subtractive synthesis?
>Date: Mon, 28 Apr 2003 15:25:55 +0200
>
> > Tim Ressel schrieb:
> > > Just caught this on my weekly backlog flush. The
> > > top-octave stuff I was doing is working, but I cannot
> > > verify the frequencies. The cheap-a$$ counter I have
> > > is not to be trusted.
> >
> > You just need a reference frequency (digital synth). Feed that and
> > your output signal into a two-channel scope and trigger with one of
> > them. I use to tune my piano this way.
>
>You should make them walk as slowly as possible in relation to each other.
>Start with seeing one or a few multiples of the waveforms. Then "zoom in" 
>with shorter
>times if you want to be picky. This is how frequency counters reference 
>oscillator
>used to be calibrated.

Or you could just breadboard a multi-octave divider to get your base 
frequencies down to something you can hear without wincing, get some 
reference pitches from a digital synth, and use your ears.

Counters and scopes are really kind of optional for work like this.

Richard