200e

yes, pitchbend is the exception, essentially using two sequential bytes per message.

this translates to pitch resolution  of approximately 1 cent if you stick to the GM 
recommended range of +/- 2 semitones. of course, the 200e oscillators can be configured 
to respond to something like +/- 3.5 octaves, in which case the stepping between values 
is quite noticeable indeed. and of course many commercial MIDI controllers are quite lazy 
in their PB output. sweep the pitch bend on an m-audio keyboard and you will certainly 
hear jittering and zippering no matter how fast the D-A conversion on the other end, 
unless some sort of interpolation is applied.

my point was simply that the observed jitter is almost certainly being produced by the 225 
and is a precise reflection of incoming messages; it is demonstrably not related to the 
261's CV sampling rate or any other property of that module.

we have considered implementing built-in interpolation to the 225's outputs as a firmware 
update, which for many users would obviate the need for a 255 to smooth out controller 
values. of course, this creates a use-case assumption which other users might find 
inconvenient...

i'm largely unfamiliar with the specific design of the frostwave or other MIDI-CV converters 
available; i'd be curious to know what kind of smoothing is being performed by these 
devices.

eb


--- In 200e@yahoogroups.com, "Gary Chang" <gchang@...> wrote:
>
> "ezra.buchla" <ezra.buchla@> wrote:
> >
> > the 225 is an honest creature; it will instantly and faithfully render
> > the incoming 8 bits of MIDI as voltage (no built-in interpolation).
> 
> The MIDI spec for the pitch bend is 14 bit, which results in a pretty
> smooth cv out - as demonstrated by the Continuum Fingerboard, which
> can output clean and smooth glisses, even through a typical midi-to-cv
> convertor (Kento, Frostwave, etc...)
> 
> One would assume that the 225e should be able to output this
> resolution;  perhaps it is a simply midi cc# assignment issue, since
> not all of the cc resolutions are as fine as the pitch bend...?
> 
> gary
>