Bc2000 (for the BCF2000 & BCR2000)

--- In bc2000@yahoogroups.com, Alex ; wrote:
> I got a DSI Mopho synthesizer and the oscillators frequencies are controlled
> by 2 parameters:
>
> 1 *Oscillator Frequency*: 0 - 120 in semitones (10 octave range). CC# 20
> and/or NRPN# 0 (for oscillator 1)
> 2 *Oscillator Fine Tune*: 0- 100. 0 = -50 cents, 50 = 0 (centered), 100 =
> +50 cents. CC# 21 and/or NRPN# 1 (for oscillator 1)
>
> I would like one of the BC's encoders would control the oscillator 1 for
> making smooth transitions without jumping in semitones. So the behavior
> would be like this:
>
> When I move the encoder clockwise the Fine Tune will be increased and when
> the value 100 is reached, Fine Tune will be reset to 0 and Oscillator
> Frequency will be increased by 1 and the whole process will start over while
> I keep moving the encoder.
>
> The opposite behavior if I move the encoder counterclockwise.
>
> Can it be done with BC Manager?

Try this:

Via the encoder dialog's "Custom output" tab, you define 2 MIDI messages:

$B0 $14 val7.13
$B0 $15 val0.6

This sends the 7 most significant bits of the encoder's value as the value for CC#20, and the 7 least significant bits as the value for CC#21.
($B0 here of course means I'm assuming MIDI channel 1.)

You should set Value 1 to 0 and Value 2 to 15460 (i.e. 120 x 128 + 100).

On the General tab:
Show value: ON
Resolutions: a value that suits your needs: 1000, even 10000?
LEDs: (e.g.) 1 dot

However, the above setup is not EXACTLY what you want:
The problem is that the BC can't be set up to exactly split an encoder's value into two "sections" with a modulus of 100 (which is what you'd want), only bitwise, with a modulus of 128 as done above:
It's as if your Fine Tune parameter runs from 0 to 127 each time instead of to 100. Presumably (indeed: hopefully!) your synth won't react when it receives a Fine Tune higher than 100. So you'll get "dead areas" while turning the encoder knob; I'm not sure how well it'll work.

Hope this helps,
Mark.

--- In bc2000@yahoogroups.com, Alex wrote:
> I got a DSI Mopho synthesizer and the oscillators frequencies are controlled
> by 2 parameters:
>
> 1 *Oscillator Frequency*: 0 - 120 in semitones (10 octave range). CC# 20
> and/or NRPN# 0 (for oscillator 1)
> 2 *Oscillator Fine Tune*: 0- 100. 0 = -50 cents, 50 = 0 (centered), 100 =
> +50 cents. CC# 21 and/or NRPN# 1 (for oscillator 1)
>
> I would like one of the BC's encoders would control the oscillator 1 for
> making smooth transitions without jumping in semitones. So the behavior
> would be like this:
>;
> When I move the encoder clockwise the Fine Tune will be increased and when
> the value 100 is reached, Fine Tune will be reset to 0 and Oscillator
> Frequency will be increased by 1 and the whole process will start over while
> I keep moving the encoder.
>
> The opposite behavior if I move the encoder counterclockwise.
>
> Can it be done with BC Manager?

Try this:

Via the encoder dialog's "Custom output" tab, you define 2 MIDI messages:

$B0 $14 val7.13
$B0 $15 val0.6

This sends the 7 most significant bits of the encoder's value as the value for CC#20, and the 7 least significant bits as the value for CC#21.
($B0 here of course means I'm assuming MIDI channel 1.)

You should set Value 1 to 0 and Value 2 to 15460 (i.e. 120 x 128 + 100).

On the General tab:
Show value: ON
Resolutions: a value that suits your needs: 1000, even 10000?
LEDs: (e.g.) 1 dot

However, the above setup is not EXACTLY what you want:
The problem is that the BC can't be set up to exactly split an encoder's value into two "sections" with a modulus of 100 (which is what you'd want), only bitwise, with a modulus of 128 as done above:
It's as if your Fine Tune parameter runs from 0 to 127 each time instead of to 100. Presumably (indeed: hopefully!) your synth won't react when it receives a Fine Tune higher than 100. So you'll get "dead areas" while turning the encoder knob; I'm not sure how well it'll work.

Hope this helps,
Mark.

--- In bc2000@yahoogroups.com, Alex wrote:
> I got a DSI Mopho synthesizer and the oscillators frequencies are controlled
> by 2 parameters:
>
> 1 *Oscillator Frequency*: 0 - 120 in semitones (10 octave range). CC# 20
> and/or NRPN# 0 (for oscillator 1)
> 2 *Oscillator Fine Tune*: 0- 100. 0 = -50 cents, 50 = 0 (centered), 100 =
> +50 cents. CC# 21 and/or NRPN# 1 (for oscillator 1)
>
> I would like one of the BC's encoders would control the oscillator 1 for
> making smooth transitions without jumping in semitones. So the behavior
> would be like this:
>
> When I move the encoder clockwise the Fine Tune will be increased and when
> the value 100 is reached, Fine Tune will be reset to 0 and Oscillator
> Frequency will be increased by 1 and the whole process will start over while
> I keep moving the encoder.
>
> The opposite behavior if I move the encoder counterclockwise.
>
> Can it be done with BC Manager?

Try this:

Via the encoder dialog's "Custom output" tab, you define 2 MIDI messages:

$B0 $14 val7.13
$B0 $15 val0.6

This sends the 7 most significant bits of the encoder's value as the value for CC#20, and the 7 least significant bits as the value for CC#21.
($B0 here of course means I'm assuming MIDI channel 1.)

You should set Value 1 to 0 and Value 2 to 15460 (i.e. 120 x 128 + 100).

On the General tab:
Show value: ON
Resolutions: a value that suits your needs: 1000, even 10000?
LEDs: (e.g.) 1 dot

However, the above setup is not EXACTLY what you want:
The problem is that the BC can't be set up to exactly split an encoder's value into two "sections" with a modulus of 100 (which is what you'd want), only bitwise, with a modulus of 128 as done above:
It's as if your Fine Tune parameter runs from 0 to 127 each time instead of to 100. Presumably (indeed: hopefully!) your synth won't react when it receives a Fine Tune higher than 100. So you'll get "dead areas" while turning the encoder knob; I'm not sure how well it'll work.

Hope this helps,
Mark.

Hi Alex

2010/12/12 Alex <alex655321@...>

>
>
> Hi Mark,
>
> It worked! You are a genius!
> I will continue this thread by email for not boring the rest of people with my thoughts about this particular thing.

I wouldn't say it's boring. Recently I was thinking about
possibilities of "tuning" SY77 FM operators (using SysEx). This thread
came just in time...

Cheers, Bruno

--- In bc2000@yahoogroups.com, Alex wrote:

> This is what Mopho Manual says in the Program Parameter Data section:
>
> 1 Oscillator Frequency: 0 - 120 in semitones (10 octave range). CC# 20
> and/or NRPN# 0 (for oscillator 1)
> 2 Oscillator Fine Tune: 0- 100. 0 = -50 cents, 50 = 0 (centered), 100 =
> +50 cents. CC# 21 and/or NRPN# 1 (for oscillator 1)

OK, that's fine then: it means that there are no overlapping ranges (which would spoil things for our BCR setup): each next cycle of Fine Tune nicely starts where the previous one stopped.

> 1 Encoder of BCR:
>
> Clockwise behavior: Fine Tune goes from 50 (centered) to 100 (1 semitone
> up). When 100 is reached, Freq Osc is increase by 1 and Fine Tune is
> reset to 50 to starts over again the whole process while I continue
> moving the encoder clockwise.
>
> Counterclockwise behavior: Fine Tune goes from 50 (centered) to 0 (1
> semitone down). When 0 is reached, Freq Osc is decrease by 1 and Fine
> Tune is reset to 50 to starts over again the whole process while I
> continue moving the encoder counterclockwise.

I think I now understand the reason for my confusion in my previous message: in your above description (as in your previous message) you imply that a Fine Tune jump from VALUE 50 (= 0 cents = centered) to VALUE 100 (= + 50 cents) is a jump of 1 semitone. But that's not the case: 50 cents is a HALF semitone; 1 semitone is 100 cents, and 1 octave (12 semitones) is 1200 cents. So that's why (in my previous message) I had started thinking that the synth uses a (very unusual) overlapping system, but as your quote from the manual shows, this is not the case. So our BCR setup should work well (apart from the dead areas from 100 to 127, but that's not nearly as serious as overlaps would be.)

Best wishes,
Mark.