From JDMcEachin Sent Tue, Apr 23rd 1996, 07:14
From JDMcEachin Sent Tue, Apr 23rd 1996, 07:14
On Mon, 22 Apr 1996, Kim G. Hansen wrote: > A divide-down circuit is a way to get multiple frequencies (polyphony) out of one > oscillator that outputs a highpitched waveform(s). > This high "top octave" is then divided down into all the lower notes... > in the Korg PS-series these notes then have each their own filter and adsr, > but share cv inputs.. To be more specific, there are 12 master oscillators, which can be tuned over the range of about an octave. These correspond to each of the 12 tones in the traditional well-tempered tuning system. Each oscillator gets divided down by octaves to supply an oscillator waveform for each of its corresponding keys. This feeds into the filter/adsr circuit, of which there are 49 - one for each key. This yields a much "fatter" sound than a traditional top-octave circuit, and allows you to do things such as microtuning or even tuning two keys to the same note. Tuning 12 oscillators is no fun (try 36 in the PS-3300!), but at least they seem to be pretty stable. JDM