#1216

FANTASTIC!!! Glad we could get you up and running!

1 Like
#1217

Hi, I have a telexi and I was thinking about modify the firmware so that I can output CV values through the usb on the teensy through midi or osc. From a hardware perspective that should work fine right I can’t fry the host or anything like that right? Maybe a dumb question.

#1218

Glad you asked. You want to make sure that the USB isn’t powering the Teensy when your TXi is connected to europower. The way to do this is to cut the trace on the Teensy beween the two pads on the underside of the board on the side of the USB connector. It is annotated on the diagram below:

image
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Once you have done this, your Teensy will need to be connected to the TXi on order to get power. This means that you need to be connected and powered in order to flash the firmware as the Teensy will no longer draw power from the USB connection.

Also, I would strongly recommend securing the boards together on the TXi to keep things from getting pulled apart.

3 Likes
#1219

Thank you so much for the information! Do you know of a really small eurorack psu that would be a good choice for powering just one telexi?

#1220

Depends on what you want to do. There are a number of options out there, mostly DIY.

I use this when I’m on the road powered off a portable battery (though @c1t1zen seems to be sold out):

https://c1t1zen.com/presta/home/9-usbpower-kit.html

1 Like
#1221

That looks like a great product, thanks for that! I was just asking about this in the Norns help thread, but then I realized I had an option in my kit already.
I have a theremin that has CV out for pitch and volume plus a gate. I would like to be able to use the theremin with the Norns or my computer. Crows will be an option but it may be overkill for a theremin. So that’s why I would like to use a telexi all by it’s lonesome.

#1222

Can someone point me to a tutorial or guide to using TELEXo as an oscillator? Im new to the teletype and having trouble understanding how to use the correct commands to use it as a sound source.

#1223

The main thing is to set both the pitch and the amplitude to audible values. To get a tone at 440 Hz from TELEXo CV out 1 you could do

TO.OSC.FQ 1 440
TO.CV 1 V 3

The TO.CV value is used to set the amplitude of the wave, so with a value of V 3 this is a 6Vpp output. You have several other options for setting the frequency, like equivalently you could use a note value with

TO.OSC.N 1 69

to set a pitch with a semitone count, or

TO.OSC 1 N 69

using TO.OSC to set a value in V/oct DAC ticks, using the N note lookup function to get the note value you want. I’ve got a TXo+, not sure what exactly the frequency limit is for TXo. Note also that you can envelope the note instead of a constant tone by turning on the envelope for this output with

TO.ENV.ACT 1 1

and then triggering it with

TO.ENV.TRIG 1
4 Likes
#1224

Excellent summary!

More small examples are in the full manual:

https://monome.org/docs/modular/teletype/manual/#telexo

1 Like
#1225

Awesome. Thanks guys, very clear explanation @csboling much appreciated!

#1226

I was similarly wondering what the N value is in reference to? So why N 69 instead of, for example, N 0-12 for an octave? I understand that this depends on what the oscillator is tuned to - I guess that’s my question. What is N 0 on the Txo?

#1227

N 69 = A440 = A above middle C, so 9 semitones above N 60 = middle C, 5 octaves above N 0 = 0 Hz. This makes N useful for doing note arithmetic, e.g. CV 1 + P.HERE N 7 to set CV 1 to the current pattern value + a perfect fifth.

Edit: Actually I guess “five octaves below middle C” would be C_{-1} = 8.176 Hz, I see something in that range on the scope but it’s a real old analog one so I don’t know the exact frequency. I’m gonna choose to regard this as an invitation to record a bunch of octocontrabass music with the TXo.

2 Likes
#1228

N stands for midi note numbers, going from 0 - 127 as described here: http://www.inspiredacoustics.com/en/MIDI_note_numbers_and_center_frequencies

3 Likes
#1229

@csboling @Leverkusen thank you both! That’s very clear now thanks.

2 Likes
#1230

Is there a way to use a keyboard midi though ansible -> TXo OSCs? Use it as a 4 key poly OSC. I’m confused if there is a way to read ansible CV status when in midi mode through teletype. Do I have to patch out of Ansible into a TXi to get it read by Teletype to output through TXo?

#1231

Yep, Ansible CVs to TXi, Gates to Teletype, with the Teletype scripts reading the CV and setting pitch on the TXo OSCs. You might need to mult out the triggers to a quad envelope generator, or use the built in envelopes in TXo (but in that case you have no keyboard control over the duration).

1 Like
#1232

Mind telling a lost soul the commands for reading Ansible CVs?
I don’t see any commands for reading CV under MIDI/POLY Mode in the manual.

#1233

Looks like they’re reading the TXi inputs with teletype, which the Ansible physical CV jacks are patched to.

#1234

Ah. makes sense now.

Wish they can make a mid.cv command like they have on KR.CV

1 Like
#1235

Yes, I did mean that the ansible outputs would have to be patched. You’d need to do that anyway for the gates as there’s no way for Ansible to trigger scripts on Teletype.

If you wanted a new op to read the midi CV, it’s all open source if you feel like scratching your own itch!

3 Likes