Just a couple of thoughts on the multiple inputs. The resonator has a lot of gain and it it easy to drive this into clipping - which isn't necessarily bad, just something I wanted to be able to control and monitor. Having three inputs which sum is just going to produce a +/- 15 volt pk-pk input which will clip so the input to the resonator and the dry mix signals will be clipped. The resonator gain controls and output attenuators can reduce the output to +/-5 volts pk-pk but with the input clipping still present.
The circuitry of the resonator uses +5 volts as the reference so you only have about +/-9 volts of usable signal range which is lower than most modules. That's why my clipping indicator is at +/- 7.5 volts.
I added the individual input controls to be able to adjust the sum of the input levels to a reasonable range for the resonator and to avoid input clipping. I also wanted to not have to adjust the individual resonator gain controls every time I added or removed an input signal.
I'm not sure that three inputs with no attenuation controls will be that useful so this is something to ponder.
I'm able to fully follow the thread on the Link Out function. The link connector on the PCB is for three additional inputs to the output mixer, presumably to link together multiple resonators. Since the output mixer is an inverter with level restoration, these need to be fed with inverted outputs referenced to + 5 volts from other resonators, so perhaps an inverted output referenced to +5 volts would be useful for cascading. I have only one module and plenty of mixers so I wasn't too interested in adding this functionality. Or, maybe I'm missing it's function and usefulness.
I don't understand what the Link Out jack is for, unless it is the output of the input mixer. In that case, I would label it Dry Out. If so, remember the reference for the internal signals is +5 volts, so Dry out has to be restored to a ground reference.
Just some thoughts to consider. - Dave
--- In ModularSynthPanels@yahoogroups.com, "wjhall11" <wjhall@...> wrote:
>
> Sorry for all the postings... just my fumbling about before I had my caffeine fix and through my bleary rhinovirus infected brain. Dave Brown's implementation details how he built this - including his clipping minimizer thing.
>
> http://modularsynthesis.com/jhaible/resonator/polyres.htm
>
> I see in Will's notes that he's planning for us to drill a hole for the LED where Dave shows it. So he must be planning to implement Dave's clever gadget.