| previous | index | next |
> and my best guess would be that it is a state-variable filter built around an LM13700, in which case the nearest module would probably be the triple resonant filter, A-127, but which of course doesn't have the HP output readily availableBut it is really easy to get at, so here are a couple of very simple, manual filter sweeps, at low, medium and high resonance settings, for both square and saw wave inputs: