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  1. Replies
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    Hello, how are you sending MIDI to the Teensy?...

    Hello, how are you sending MIDI to the Teensy? 6N138 based circuits work fine, do you have the circuit diagram that you used?
  2. This is really nice work and forms a very usable...

    This is really nice work and forms a very usable all-in-one instrument. You mentioned effects, will the delay sync to the tempo with divisions (1/4, 1/8, 1/16...)?
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    Ok, that makes sense. Thanks very much for your...

    Ok, that makes sense. Thanks very much for your time.
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    Hello, the code is available here if anyone wants...

    Hello, the code is available here if anyone wants to take investigation further: https://github.com/ElectroTechnique/TSynth-Teensy4.1/tree/master/TSynth. I'm not using PROGMEM on the declaration...
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    Yes, I've got more PROGMEMs. Adding another in...

    Yes, I've got more PROGMEMs. Adding another in Detune.h caused it. No PROGMEM on functions but I've got FLASHMEM on a number of functions in several files. Trying to allow more memory!
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    section type conflict

    Hello I'm getting a section type conflict error when I compile on T4.1 : VELOCITY causes a section type conflict with CHORD_DETUNE_STR


    If I add another declaration marked PROGMEM in one file, I...
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    Here but requires some work:...

    Here but requires some work: https://forum.pjrc.com/threads/60470-Teensy-4-0-Audio-Library-screen-oscilloscope
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    Code for oscilloscope audio display wanted

    Sorry delete - I've found what I wanted.
  9. Replies
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    Any demo? I'll show you mine if you show me...

    Any demo? I'll show you mine if you show me yours..?
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    Hello, looks very intriguing. Any more details?...

    Hello, looks very intriguing. Any more details? Can you play anything you like on it or is it limited only to the hits of Justin Bieber? (I've never listened to him by the way.) Are you outputting...
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    If you remove it from the prototype board does it...

    If you remove it from the prototype board does it work?
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    Compiling overclocked firmware problems

    Hello! Some of my users have had problems with firmware I've provided :(, on their newly built TSynths :cool:, despite it working fine on mine :confused:. They were getting noise, not of a synth...
  13. Hard sync! Great, I'll have play.

    Hard sync! Great, I'll have play.
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    A pair of 4 inch long wires with du Pont...

    A pair of 4 inch long wires with du Pont connectors work fine too apparently. This is what one of the buyers of TSynth used to connect to the PCB.
    21239
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    You need to give us access. Can you post a PDF...

    You need to give us access. Can you post a PDF instead?
  16. Beautiful! Thanks...

    Beautiful! Thanks...
  17. Hello Mark. Square and sawtooth are great, the...

    Hello Mark. Square and sawtooth are great, the pulse wave is fine until there's any sort of modulation, even around 0.5Hz. There's digital noise that isn't regular but often. Can it be improved? Many...
  18. Thanks for the replies and ideas. I'll start...

    Thanks for the replies and ideas. I'll start looking into optimising memory next.

    By the way, I've taken the delays out of the Mux ADC reading code. Before, I needed a varying amount of time to...
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    It's odd that you are asking about the DC...

    It's odd that you are asking about the DC resistance. This is usually low around 1ohm and not really a significant factor (unless you're dealing with significant currents). You know that 600 and 120...
  20. Hello, again. I knew you were all on the edge of...

    Hello, again. I knew you were all on the edge of your seats, reloading the page every five minutes to see if there was any update or solution to this :rolleyes:

    I suspected that it might be a...
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    Hello, this is of no help, but I've not noticed...

    Hello, this is of no help, but I've not noticed particular problems with the Audio Lib in TD1.53 and I'm using about 260 audio objects and 546 patchcords. Can I suggest you create the waveform...
  22. T4.1 Interrupts(?), analogRead, usbMIDI problems

    Hello, sorry if any of this is vague. I can't immediately post all the code to demonstrate this as there is a lot that would need cutting down - I'm just looking for ideas of what the problem(s) may...
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    Yes, GND as one would expect.

    Yes, GND as one would expect.
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    There is nothing wrong with the encoders you've...

    There is nothing wrong with the encoders you've bought (commonly available Keyes KY-040). They have pull-up resistors attached (pull-up to +V) which aren't needed but won't have any detrimental...
  25. Great! I'll test. Yes, I was reminded of...

    Great! I'll test. Yes, I was reminded of Walter/Wendy Carlos and Clockwork Orange while listening to it...
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    Have you de-bounced the push buttons (including...

    Have you de-bounced the push buttons (including on the encoders)? Also what code are you using for the encoders (the link in video wants cash to see the code)? Your saying that if you turn one...
  27. Yes, triangles sound fine. The variable triangle...

    Yes, triangles sound fine. The variable triangle wave can be varied to a sawtooth and reverse sawtooth, I imagine trying to band-limit at just those points is a pain. The square and sawtooth are a...
  28. Ok! That's solved the distortion. The problem...

    Ok! That's solved the distortion. The problem with the locking-up is I think, because of me over-stretching the T3.6 (CPU maxes at 141:confused:), T4.1 seems fine. I'll carry on testing, I'm...
  29. Try the PlaySynthMusic example...

    Try the PlaySynthMusic example (Audio-->Synthesis-->PlaySynthMusic) with the waveforms all set to WAVEFORM_BANDLIMIT_SQUARE:


    // allocate a wave type to each channel.
    // The types used and their...
  30. I'm testing the code at the moment and it sounds...

    I'm testing the code at the moment and it sounds fine until I change the frequency while notes play, using waveform.frequency(XXX); The sound becomes distorted and I also get complete lock-ups with...
  31. Thanks Mark, this is a major improvement and...

    Thanks Mark, this is a major improvement and sounds quite clean. Yes if it could be integrated into the existing synth_waveform files, everyone would benefit without making any changes themselves. I...
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    Hello, use the USB Host and connect your...

    Hello, use the USB Host and connect your (hopefully) MIDI Class Compliant keyboard directly to it. It works great! You need to connect to the USB Host pads (D+ and D-) on the bottom of the T4.0 and...
  33. Ah, that's the same method (and code) as I've...

    Ah, that's the same method (and code) as I've used!

    I've said several times and it's worth repeating, if someone who knows what their doing could have a go at making the waveforms in the Audio...
  34. Yes, really a very nice project, certainly worth...

    Yes, really a very nice project, certainly worth being featured on the blog. I'm curious about how the band-limited waveforms were written and integrated to work with the rest of the audio library....
  35. I use this on TSynth ...

    I use this on TSynth for the square and sawtooth waves: https://forum.pjrc.com/threads/41905-Band-limited-Sawtooth-wavetable-C-generator-for-quot-Arbitrary-Waveform-quot-(and-its-use)
    It's fairly...
  36. Hello, it sounds fine, it's just the change-over...

    Hello, it sounds fine, it's just the change-over from one note to another. The best way to eliminate it, is to make it polyphonic.

    But try adding envelope1.releaseNoteOn(milliseconds); This might...
  37. Hello Robert, I tried the code from your first...

    Hello Robert, I tried the code from your first post on a T4.1 with the Audio Board Rev D and cannot hear any crackling. I've sent MIDI via both Serial1 and the USB Client with Ableton Live. There's a...
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    Thanks for the replies. I looked at the 4067...

    Thanks for the replies. I looked at the 4067 datasheet and wondered if it was nearing the limit of how fast it could be reliably read. I should probably stop being lazy and put a scope on it and get...
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    Ferrite 600 and noisy MUXs on T4.1

    Hello I'm moving from a T3.6 to a T4.1. My MUXs have a lot of noise when reading analog signals now (from the 600MHz MCU?) I have a separate ground plane for the pots I'm reading. I want to...
  40. Thread: T4.1 Schematic

    by UHF
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    Teensy 4.0 does not appear to have an AGND...

    Teensy 4.0 does not appear to have an AGND according to it's schematic.
  41. Thread: T4.1 Schematic

    by UHF
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    Ok, sometime soon. I've got @blackketter 's T4.1...

    Ok, sometime soon. I've got @blackketter 's T4.1 KiCAD symbol and just wanted to know if pin 25 aka 47 :confused: (top right GND) is still AGND? Thanks anyone.
  42. Thread: T4.1 Schematic

    by UHF
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    T4.1 Schematic

    Hello, is there a schematic for T 4.1 please?
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    https://forum.pjrc.com/threads/59185-help-reseting...

    https://forum.pjrc.com/threads/59185-help-reseting-the-phase-of-sine
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    Oh crikey!!! Yes the Audio Library can...

    Oh crikey!!! Yes the Audio Library can seductively carry you away! Your wiring is quite neat considering the audacity of so many controls and LEDs. You've got multiple waveforms mixing together,...
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    The ADC on the Uno has an input impedance of 100M...

    The ADC on the Uno has an input impedance of 100M and possibly a significant input capacitance, compared to the K66 on the T3.6 (up to 5K). The Uno is less sensitive to the noise.
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    Hello, your voltage divider resistors have...

    Hello, your voltage divider resistors have significantly high resistance, why do they need to be so high? The 16-bit ADC is only getting a few microamps of current, the noise is probably also of the...
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    Thanks. Running InputFunctions gives some SysEx...

    Thanks. Running InputFunctions gives some SysEx messages which I'm assuming are specific to the controller when it first connects, plus the selection of controller messages it's chosen to send....
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    USB Host port connection detection

    Hello, sorry if I've missed this elsewhere in the forum. I want to detect when a MIDI controller is plugged into the USB Host port of a T3.6. Is there a callback that I can use to detect this? I want...
  49. I really don't envy your task, trying to...

    I really don't envy your task, trying to accommodate variations of what often appear to be the same displays. Again, thanks for both your efforts and for frame buffering! That really made a massive...
  50. My display is a ST7735S by the way, the library...

    My display is a ST7735S by the way, the library only mentions ST7735B and ST7735R screens, hence the INITR initialisers.
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