hey gary!
has this updated version been released yet? i've been playing with the
old version recently.
gregg
--- In
ComputerVoltageSources@yahoogroups.com, "Gary Chang"
<gchang@...> wrote:
>
> Hello all,
>
> Soon, a new version of the gc-sah-sr-qua.bas will appear - Original
> code written by Woody Wall and revised by Dave Brown.
>
> This program converts the PSIM into a Serge Analog Shift Register -
> actually several of them, allowing for up to 16 stages, which would
> take 6 Serge triple ASRs to replicate.
>
> Thanks so much to Dave Brown for his time this weekend in this effort
> - I very much appreciate your incites on the PSIM.
>
> After some experimentation, some realizations are evident to me.
>
> 1). Dave's analysis of the PSIM's accuracy is spot on. ALL PSIM
> programs that are designed to have accurate input/output ratio
> throughput should reflect Dave's research.
>
> As Dave describes:
>
> For input, the range is 1024 steps over 10 volts, or 9.76 mV
> increments.
>
> For output, the range is 4096 steps over 10.666 volts, or 2.60 mV
> increments.
>
> Thus to pass an input to output, the scale factor is (10/1024)X
> (4096/10.666) which is 3.75.
>
> Thus to scale the input to output, it needs to be multiplied by
> 3.75, (not 4). I typically multiply by 15/4 to keep the math
> integer based.
>
> Note that 10.666 volts was chosen to calibrate to semitone
>
> [end Dave's quote]
>
> 2). For the purposes of a shift register application such as
> gc-sah-sr-qua.bas, IMHO, quantization is unnecessarary.
>
> First off, many of the patterns that one may want to "arabesque-asize"
> with a Shift Register will be already quantized - this makes the
> issues of "arguments" between the PSIM's interpretation of what the
> input is possible - I found that, even with Dave's more accurate
> input/out ratios installed that my PSIM was constantly arguing with my
> Sequantizer about what pitch it should e playing.
>
> Secondly, I found that the unquantized shift register is not only more
> accurate, but the wider range of the unquantized version is much
> better use when utilizing the Shift Register to controll non-pitched
> modules. It is also much more accommodating to patterns with wider
> pitch ranges (such as playing a sequence that spans more than two
> octaves). In this regard, the unquantized version performs brilliantly.
>
> Thirdly, the unquantized version operates identically the Serge Analog
> Shift Register - which, for me, is the architypical Shift Register in
> my life....
>
> Gary
>