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Subject: Re: [motm] Finalizing the (new) MOTM-102 module

From: Mark <yahoogroups@...>
Date: 2008-02-06

On 2/3/08, Paul Schreiber put forth:
>a) I am dropping the Vibrato section of the '101, and replacing it with a
>tunable noise source (there are still White/Pink/Slow Random)
>----- Now, should I ∗drop∗ Slow Random, and instead have Internal Clock Out?

An internal clock out is a popular and easy mod for the MOTM-101, but
might not be so easy to add to the proposed 102 due to its SMD
design and possible lack of panel space. So, yes, I think it would be better
than a slow random output (which I've never used for its intended
purpose). That way, people with smaller systems don't have to tie up
a 320 or something just to get a clock.

Also, if there is only one noise output with a knob, wouldn't a more
extreme setting be equivalent to slow random??

Perhaps we could get a better description of the user interface -- a
list of all the knobs and jacks.

>c) the time delay ∗between∗ taps can be set by a panel pot from 0 (typical
>ASR to 256). So, at maximum, there are 1024 clock between the input being
>sampled, and that voltage appearing on the output of Tap #4.
>
>d) early calculations have indicated that the S&H code can be clock at a
>∗minimum∗ of 1Khz. So, at max tap setting, you can get a 1sec delay.

Could you please explain that again?? For analogue S&H and ASR
modules, the sampling rate is the same as the step clock, where the
delay time is only limited by droop. How does that relate to the
frequency of code clock in this module??

>f) there is a pot (not an input CV, no room) to set a couple of quantizing
>scales. We don't have a lot of room in the ARM's Flash for 256 14-bit scales
>:) We can stick 4-6 scales in there. Suggestions for ∗which∗ scales needed.
>Note: this module is NOT intended to be a general-purpose quantizer. That is
>another module altogether. Rather, this is specifically to quantize the S&H
>output. As in the '101, the default S&H input is Pink Noise (no patchcord
>inserted into the S&H IN jack).

That sounds like a nice feature, as the quantized random voltages of
the SH-101 and other synths is a popular sound. It would also make
the "playing chords by loading an ASR" trick much easier. So my
suggestion for four quantize settings would be chromatic, major,
minor, and 6-bit.

On 2/3/08, Richard Brewster put forth:
>3) I'm trying to understand the delay factor. If this is set to 256 and
>the input clock is 256 Hz, does this mean that the outputs change once
>per second, or 256 times per second? If the latter, does this mean that
>the 2nd tap lags the first by 1 second? The 4th tap would be delayed by
>3 seconds here? Maybe you can describe it better.

I don't get it either.