Voltage Control Lags With TMax

Posted: 6/24/2007 3:26:09 PM
teslatheremin

From: Toledo, Ohio United States of America

Joined: 2/22/2006

kidelectric wrote:

'Yes, this is exactly what I'm looking to do. Could you share what you did? It does seem a bit cryptic for how to get it to work as a CV-MIDI converter, though the PAiA website specifically says it can be done (just not how)

Would you recommend switching from Velocity Gate to Volume Gate as outlined on the PAiA site?
http://www.paia.com/ProdArticles/therefaq.htm#drift

I think I am going to do what you had done and have some SPDT switches for mixing and matching mods. I'm thinking: one for the velocity/volume gate; one for the 10k resistor for coupling the pitch and getting a more saw-wave RCA tone; and then one of the kkissinger ones he had mentioned.

I also plan on removing the .005 disc as suggested by PAiA for more dramatic square timbre (if I change the timbre, I really want it to change noticeably, not tiny amounts)
Finally, I will probably do the kkissinger mod mentioned about for getting out the pitch lag (which will be important if I use the MIDI fader)'

The Paia Midi-fader board should be installed as far away as possible from the T-max board in the same case. The Midi-fader board should not be mounted between the volume and pitch antennae inside the case. The Midi-fader board should not mounted above the T-max board.All these scenarios can cause theremin tunability issues even tho the T-max is pretty forgiving in this respect. I guess my advice would be to consider your case size and configuration carefully.

Yes, I would recommend the Vol/Velocity Switch Mod. I have it installed on my T-max. Also, I would highly recommend the Pitch Preview Mod, as well. Radio Shack ,(perhaps), still sells a mini- amplifier that runs on 9 Volts. It has an earphone jack. I made the necessary circuit board mods for the T-max Pitch Preview, took the electronics out of the mini-amp, cut off it's speaker and threw the case away. I then made the proper connections from the T-max to the mini-amp board, affixed the mini-amp board to the inside of my T-max cabinet, connected it to the common power feed and installed the mini-amp's earphone jack to the There Max front panel.
Of course PAiA sells a kit to do the same thing.

The matter of the Midi-Fader,(henceforth MF), is a little complicated to sort out as to the settings on the MF circuit board's S1 and the eight J5 CV inputs. Also, when experimenting on or using the MF with a MIDI capable keyboard connected, a key will have to be depressed and remained depressed, (weighted or wedged down). The MF does not send note-on MIDI information. The MF will send alot of other MIDI messages,( I personally was only concerned with pitch bend and volume change messages). Also the sound or patch selected on the MIDI keyboard has to be set to be shaped by those MIDI messages. Those are a lot of variables to overcome to get the MF to do what we would like: control pitch and volume like a Theremin!

Kidelectric, I will post more later after I review MF notes again.

teslatheremin
Posted: 5/11/2009 6:47:58 PM
teslatheremin

From: Toledo, Ohio United States of America

Joined: 2/22/2006

WoW Sorry!
It has been so very long!
To see my ThereMax Midi-Fader board integration,
Log in and then click on my name and take a look at my profile. Then click on the 'My Space' link. If you are already a 'My Space' user, sign in and then look at the internals of my ThereMax in my Pics.
There will be a row of switches mounted to a strip of wood toward the end of the pics page. These SPST switches,(I am using SPDT's in my unit because of initial cost), are each wired one side to one CV output of the Midi-Fader board and the other side to Midi-Fader board ground. There is a master DPDT switch in the middle between the two sets of four SPDT switches, which is wired to the Midi-Fader board CV switches and the Pitch CV and Volume CV output jack 'tip' lugs, that flips the pitch and volume loop controllers.
This is just a way to use a switching 'Process of Elimination' method to find the correct settings for the PAiA Midi-Fader board.
It gives me pitch control and volume control. I think the pitch control is really Midi Pitch Bend, and Volume control is just that.
Good Luck!
teslatheremin
Posted: 5/11/2009 7:09:57 PM
kidelectric

From: Napa, CA

Joined: 6/9/2007

awesome, thanks for following up on this after all this time!

I never did finish modding out the board, so I'll check your mySpace and this should come in handy
Posted: 5/11/2009 8:55:04 PM
teslatheremin

From: Toledo, Ohio United States of America

Joined: 2/22/2006

kidelectric,
I have taken some better Pics of the Midi-Fader board integration of my ThereMax, and I will post them to my 'My Space' site, soon.
I am glad you are still here at Theremin World!
Good Luck to You!
teslatheremin
Posted: 5/26/2009 5:59:06 PM
teslatheremin

From: Toledo, Ohio United States of America

Joined: 2/22/2006

Hello KidElectric,
I have taken the pics, but I am having problems accessing My 'Myspecious' account. I guess I have a virus or too much security, or both.
ARRRGHH!
I think you will get the whole idea of my MIDI-FADER integration to the T-Max if you can see the pic I want to upload.
I must admit that I am dunce when it comes to making a picture site that is internet accessible.
Alot, of what I have tried already has been denied by my security software. I have turned that software off, and get the same results.
I can not see the 'tinyurl', EVER, on this
lap-pi-ty top-box!

I call to, and chant, and make sounds up the computer tree
to the GREAT GORDON!
HELP!

Oh, HE bought an Apple Product--- nevermind.
Good Luck, and stuff.
teslatheremin

P.S.--- I am still working on IT!
Posted: 5/26/2009 8:07:08 PM
kidelectric

From: Napa, CA

Joined: 6/9/2007

Well, keep me posted, and if you can get those pics up somewhere (Flickr might be good?), let me know!

I'm going to be doing some serious troubleshooting on the Tmax this weekend...

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