Discussion about the Korg PolySix synthesizer

Peter,

The logic probe measures whether logic states in TTL or CMOS 
circuitry are a binary 1 or 0. Remember we talked about how the 
binary pattern on lines A, B, C, INH set which outputs on IC31 are 
selected? This tool would tell us how they are set and whether they 
were switching on a the right time.

However, from the description how the six LEDs are lighting up (yes, 
one after the other in POLY mode - I am an idiot!) it sounds like 
IC31 is working correctly and keyboard assigner is sending the right 
binary pattern to the switch. 

I expect the input on pin 3 is the problem. What I will do is take 
some reading from my working Polysix and let you know how the 
circuitry should function. I'll post this after the weekend, if you 
can wait.

Also, I'll take you are playing with the settings in manual mode and 
not from the patch banks? When the SRAM (memory) failed on my P6 the 
patch banks just contained random bit patterns which produced sound 
which could be very much be described as 'out of tune'! Just a 
thought...

Cheers,
Andy




--- In PolySix@yahoogroups.com, "hjulskov" <hjulskov@...> wrote:
>
> Thanks Andy,
> 
> The LEDS (D10) does light in order in polymode (which I think was 
what
> you meant?) -in unison they all light simultaniously.
> In Polymode all voices sounds equally (bad).
> 
> 
> I'm not sure about your last question (Can you lay your hands on a
> logic probe at all?)?  
> 
> 
> Cheers,
> Peter
> 
> 
> --- In PolySix@yahoogroups.com, "Andrew Jury" <andy@> wrote:
> >
> > Hi Peter,
> > 
> > I am afraid we can't make that assumption until the logic that 
controls 
> > IC31 has been tested. This device is basically a switch. You 
apply a 
> > binary pattern to lines A, B, C and INH and this determines which 
one 
> > of the outputs is connected to the input. The input is marked X 
the 
> > outputs marked X0, X1, X2, etc. It is the outputs which we just 
tested 
> > and which don't seem to move. Tell me, do the voice LEDs (D10) 
come on 
> > in order in Unison mode? Everytime you press a key an alternate 
voice 
> > LED should light up. I suspect not?
> > 
> > Can you lay your hands on a logic probe at all?
> > 
> > Cheers,
> > Andy
> >
>