[sdiy] Looking for a tinny MIDI controller (patch change needs for Roland GR-55)

[Jean-Pierre Desrochers]

Good suggestions Brian,

The 17-18 switches trick is a good one.
I already have all the programming stuff (C code compiler + programmer)
to implement these.

I'll think about that.
Many thanks.

JP

Le 2016-04-30 18:24, rsdio at audiobanshee.com a écrit :
> In my estimation, you already have the perfect platform for sending
> the Up/Down MIDI Preset system that you need.
> 
> I predict that you will not find any existing product that already
> solves the desired feature of stepping through all GR-55 Presets.
> Because of the banking setup, nothing will be well-suited other than
> the GR-55 controller itself.
> 
> That means your only remaining option is some kind of programmable
> platform where you can create the feature yourself. The key is that
> you already have a programmable platform, with source code and
> schematic. I recommend that you enhance the PIC firmware to add the
> feature that you want. Perhaps, holding button 18 during power-up
> would create a temporary mode where buttons 18 and 17 implement the
> Up/Down feature, including knowledge of the specific GR-55 Banks and
> the number of Presets in each GR-55 bank. The PIC firmware could exit
> this temporary mode as soon as you push another button. This doesn't
> even conflict with the existing feature where buttons 1 through 16
> select the MIDI channel at startup.
> 
> I realize that my suggestion requires that you be able to program the
> PIC, both in terms of writing the source code and loading the Flash on
> the PIC, but these steps are going to be necessary no matter what
> platform you buy.
> 
> Brian Willoughby
> Sound Consulting
> 
> 
> On Apr 30, 2016, at 2:46 PM, Jean-Pierre Desrochers 
> <jpdesroc at oricom.ca> wrote:
>> Here are all the public files about my 3 x 8 MIDI foot controller:
>> http://www.arcenson.com/projects/MIDI_Foot_Controller/
>> 
>> The complete unit is here:
>> http://www.arcenson.com/projects/MIDI_Foot_Controller/Pictures/19_Finished_Controller.JPG
>> 
>> I had plenty of PIC16F88 chips to be used so I made that project 
>> around it.
>> All the leds and switches are multiplexed to keep PIC16F88 pin usage 
>> low.
>> A 8Mhz internal clock is used.
>> At start the MIDI channel that will be in use flashes the
>> led with the same number. (Here it's the led#1 that flashes).
>> But if one of the first 16 switches is held down on start
>> the selected number will be the MIDI channel in use.
>> Again the 18 foot switches call for the first 18 USER presets on the 
>> GR-55.
>> I could have made a so much more complicated project but this minimum 
>> is usefull with that synth.
>> 
>> Cheers,
>> J-Pierre
>> 

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