Bc2000 (for the BCF2000 & BCR2000)

Thanks so much for doing this!  Very appreciated. I hadn't realized that the pitch bend output only included the MSB.  That's odd!  I'm glad to hear that there's a way to get around that.  

It does indeed sound like it has 10 bit resolution.  And I agree that the differences would be due to analog differences.  Different pots, etc.

It certainly did help.  However much I wish that the resolution were finer, 10 bit was the minimum I was hoping for.  Very few boxes that I've been able to find do better, most are worse at 8 bit.

Thanks again!



--- In bc2000@yahoogroups.com, "Mark" <markwinvdb@...> wrote:
>
> --- In bc2000@yahoogroups.com, "budwardp" <budwardp@> wrote:
> > does anybody know what kind of resolution the foot controller input
> > is capable of?  I've read that it can output 14 bit pitch bend - but
> > I'm wondering at what bit depth the input is sampled.
> > 
> > Most controllers seem to be 7 bit (0-127) which are then output as 14
> > bit numbers with large gaps between each number.  Or, as in the case
> > of many faders (such as on the bcf2000) 10 bit (0-1023.)   Very few
> > do 12 bit (0-4095).
> > 
> > I'm really hoping that the bcf2000 will give at least 10 bit.
> > 
> > (A simple test would be to output the foot controller as pitch bend
> > and see what the smallest incremental change is.)
> 
> First of all, your "simple test" was a bit tricky to perform: the BCF's "standard" Pitch Bend setting leads to 7-bit output, since the LSB value is always 0. (See "BC MIDI Implementation.pdf" (section 16.5) at http://home.kpn.nl/~f2hmjvandenberg281/ .)
> 
> However, there is a way to get a higher resolution, namely by defining a "custom" setting for the foot control, specifying the individual bytes of the pitch bend message (e.g. "$E0 val0.6 val7.13") and specifying the full 14-bit range (0-16383).
> 
> This gave me the following output values (using my Roland EV-5 pedal):
> 0. 16, 34, 50, 68, 84, 101, 118, 135, ...
> 
> I've tried the same settings for two faders, each with the following results:
> 0, 16, 33, 49, 67, 83, 99, 117, 133, ...
> 
> Conclusions:
> 
> The fader output values differ from the foot control output, and neither has a fixed step size.
> So the BCF doesn't seem to impose any limits in the digital domain: it doesn't automatically set any bits to zero.
> 
> The varying step sizes must reflect limitations in the electrical, analog domain.
> In general the step size lies around 16, so that basically amounts to a 10-bit resolution (14 bits minus 4), with 1024 different values (16384/16).
> 
> Hope this helps,
> Mark.
>