Highly Liquid Forum facebook twitter google plus rss feed
  #1  
Old 12-20-2012, 01:49 AM
wmarshmusic wmarshmusic is offline
Junior Member
 
Join Date: Nov 2012
Posts: 16
Default Texas Instruments Speak & XXXXX

Hi all,

I guess I missed the boat on the MIDISpeak units, but I would still like to modify a TI Speak & XXXXX with MIDI control capability, but also I would like to be able to control some circuit bends using relays and possibly a photocoupler to control pitch.

Which product would you suggest for that function?
Reply With Quote
  #2  
Old 12-20-2012, 02:54 PM
John's Avatar
John John is offline
Moderator
 
Join Date: Jan 2009
Posts: 3,007
Default

Quote:
Originally Posted by wmarshmusic View Post
Hi all,

I guess I missed the boat on the MIDISpeak units, but I would still like to modify a TI Speak & XXXXX with MIDI control capability, but also I would like to be able to control some circuit bends using relays and possibly a photocoupler to control pitch.

Which product would you suggest for that function?
The MSA-R is good for circuit bending because the outputs are reed relays. They are just like SPST toggle switches that you might use for manual control.

I have successfully implemented MIDI pitch control using the same digipot IC that is used on the MPA. You can hear the results in the first audio sample here:

http://glitchdesk.com/cb/018/
Reply With Quote
  #3  
Old 12-20-2012, 06:11 PM
wmarshmusic wmarshmusic is offline
Junior Member
 
Join Date: Nov 2012
Posts: 16
Default

Thanks for the info, John.

Would you recommend installing both the MSA-R and the MPA?

What if I also want to control the Speak's normal functionality via MIDI? Would the MIDI CPU be capable of controlling the unit's normal functions and also allow me to send signals to control SPST relays?
Reply With Quote
  #4  
Old 12-20-2012, 08:06 PM
John's Avatar
John John is offline
Moderator
 
Join Date: Jan 2009
Posts: 3,007
Default

Quote:
Originally Posted by wmarshmusic View Post
Thanks for the info, John.

Would you recommend installing both the MSA-R and the MPA?
They can't really be "installed" in the Speak. "Attached" may be a better word. But basically, if you know how to do the bends, all you have to do is substitute an MSA-R output for a regular switch. Voilą: you have MIDI controlled bends. You can also use the MSA-R in this way to trigger a button press.

Same for the MPA. Just find a bend that requires a potentiometer, and substitute the MPA digipot output in the circuit.

So, yes, if you want both pitch bend and circuit-bend or button triggers via MIDI, then use both.

Quote:
What if I also want to control the Speak's normal functionality via MIDI?
You can use the MSA-R as described above to trigger buttons. Potentially, you could also use the UMR2 to trigger the buttons, but because of the logic family mismatch, there would be enough extra work involved that you might as well use the MIDISpeak open source to build an actual MIDISpeak unit. All the files including the board design and firmware are provided.

Quote:
Would the MIDI CPU be capable of controlling the unit's normal functions and also allow me to send signals to control SPST relays?
Yes, the MIDI CPU can control any MIDI device, including the MSA, MPA, and MIDISpeak. What functions it would control on the Speak depends on how you wire up the MSA, MPA, or MIDISpeak.

Let me know if I can provide more information.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 07:37 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.