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  1. Replies
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    But limited to once a month! Looks generous with...

    But limited to once a month! Looks generous with decent delivery. I think the limit on size is 12cm square per PCB for five, two-layer.
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    Yes, usually it's a day of good feedback and then...

    Yes, usually it's a day of good feedback and then they start disagreeing with each other. Try asking if the shield on a USB connector should be grounded... This forum seems exceptional by contrast.
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    Thanks very much for this. It's solved a problem...

    Thanks very much for this. It's solved a problem where resonance values below 1.1 were causing noise for me.
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    You could try the EEVBlog forum.

    You could try the EEVBlog forum.
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    Hello, you know that Teensy 4.0 and 4.1 already...

    Hello, you know that Teensy 4.0 and 4.1 already have USB Host capability? You would be better off with a 4.1, as the host pins have a proper 0.1" pitch plus power management. You can set USB type in...
  6. I like Marco Reps channel on Youtube for...

    I like Marco Reps channel on Youtube for entertainment mostly, although sadly he makes videos less often these days. In one he uses a DIY vapour-phase reflow oven to solder some components. Not for...
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    It's in here:...

    It's in here: https://github.com/PaulStoffregen/Audio/blob/master/filter_variable.h

    Perhaps you're misunderstanding what filterOctave does? And I am too? Perhaps someone can explain, I though it...
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    You need to set filterOctave lower (1.0f) and...

    You need to set filterOctave lower (1.0f) and it'll track properly. This is why my code has this odd feature where filterOctave is changed with cut off freq, to maintain deep basses at low cut off...
  9. Get a 4.1 because you'll want the power for...

    Get a 4.1 because you'll want the power for band-limited waveforms and you can go mad without hitting a limit too soon. Plus it has USB Host so you can connect a MIDI Class Compliant controller...
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    Thanks very much.

    Thanks very much.
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    ... sorry, to make this clear - I want to access...

    ... sorry, to make this clear - I want to access the SD card on the T4.1 as a mass storage device.
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    Hello, is it possible to get a T4.1 to enter mass...

    Hello, is it possible to get a T4.1 to enter mass storage device mode on the USB client port? I'm running it as a Serial + MIDI + Audio port, so I suspect it would have to reboot in some way to enter...
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    Yes, it does the job. No noises. CPU usage on a...

    Yes, it does the job. No noises. CPU usage on a T4.1 is up a bit.

    Testing with patch 1 Solina with current linear envelope and this adjustable one:


    resting 1 note 4 notes ...
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    Some interesting modification bits and schematic...

    Some interesting modification bits and schematic here: https://maffez.com/wp-content/uploads/2020/04/TD3MODS_VERSION1_999.pdf
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    I think digipots are the wrong way to go, as you...

    I think digipots are the wrong way to go, as you want to control the synth with the on-board pots and allow control by MIDI via the Teensy. All control will go through the Teensy. Something like...
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    I think you mean MIDI CC messages...

    I think you mean MIDI CC messages? SysEx is for manufacturer specific messages such as saving/loading complete patches. You need to read the voltage off each pot with a multiplexer into an adc and...
  17. Very impressive, saw this on Synthtopia. The...

    Very impressive, saw this on Synthtopia. The hardware is very nice. Because we're on PJRC, I'm curious about what's under the front panel. How is the Teensy managing CPU and RAM-wise? You must be...
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    Yes it's T4.1. If you want to use the current...

    Yes it's T4.1. If you want to use the current TSynth code, you can comment out three lines in the loop() like this so that it doesn't try to read non-existent pots and switches:



    void loop() {...
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    I'm playing a polyphonic synth with 12 envelopes....

    I'm playing a polyphonic synth with 12 envelopes. The noise is either on the left or right channel. I'm using A/D/R from 1ms to 12s and sustain 0 to 1. I'm using your envelope as a replacement for...
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    No, it's still there. Significantly, it only...

    No, it's still there. Significantly, it only occurs on left or right channels, not both at the same time. Also it's polyphonic. I'll try and produce some cut down code.
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    Hello, I'm giving it a try on a Teensy4.1 based...

    Hello, I'm giving it a try on a Teensy4.1 based synth. The effect is good and CPU usage doesn't appear much different to me. It's probably exactly what I'm looking for. However, I'm getting noise at...
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    Ok, I'm asking because I tried the code in #6...

    Ok, I'm asking because I tried the code in #6 expecting to see the free RAM size change when called during execution, but it stays the same value. I think I'm misunderstanding something. I was hoping...
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    Is there a way to see RAM usage during program...

    Is there a way to see RAM usage during program execution, in the similar way as repeatedly calling AudioProcessorUsage()? Thanks.
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    It seems intermittent. I can't see a pattern....

    It seems intermittent. I can't see a pattern. When Decay level is set to minimum (1ms) and Sustain to zero, I also get a high-pitched artifact too.
    Someone else needs to test. Here's a sound file...
  25. Yes it does.

    Yes it does.
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    Yes, but it could be a similar problem. Just a...

    Yes, but it could be a similar problem. Just a thought.
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    I'm using AudioSynthWaveformDc for portamento but...

    I'm using AudioSynthWaveformDc for portamento but an exponential response instead of a linear one, that mimics capacitor charge/discharge would be preferable.
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    It would be great to add this to the...

    It would be great to add this to the AudioSynthWaveformDc object too, so that better portamento glides can be made.
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    It usually varies between 35 and 65%. I don't...

    It usually varies between 35 and 65%. I don't know what you mean by modes. I'll have a further play. It is intermittent as the sample shows.

    WCalvert says in another post It does not have the...
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    Hello I'm testing it on TSynth using a T4.1....

    Hello I'm testing it on TSynth using a T4.1. Global variable usage on compile has gone from 279828 bytes (53%) to 312596 bytes (59%) just by including the two files. Using it on both the 12 amp...
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    Hello Emmanuel. Yes, handing voices to in-coming...

    Hello Emmanuel. Yes, handing voices to in-coming notes is something that took me a while to implement on TSynth until I just sat down and wrote a series of operations based on what should happen. It...
  32. Hello, yes probably. If it's the VGND pad where...

    Hello, yes probably. If it's the VGND pad where the jack is soldered, used the VGND pad underneath:

    https://www.pjrc.com/store/teensy4_audio_back.jpg

    You can email the TSynth developer directly...
  33. Hello. Can I ask you to do an experiment and try...

    Hello. Can I ask you to do an experiment and try a 100ohm resistor on the CLK line close to the T4.1?
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    No, actually having bothered to look at the...

    No, actually having bothered to look at the specifications https://www.midi.org/specifications/midi-transports-specifications/5-pin-din-electrical-specs, I see that pin 2 of MIDI in can be grounded...
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    That'll be me then. Yes the beep sounds familiar...

    That'll be me then. Yes the beep sounds familiar from a while back. Running out of RAM possibly? I don't think it's a hardware problem. When you compile, does it state how much memory global...
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    Really very nice engineering all round. The NDLR...

    Really very nice engineering all round. The NDLR is similarly a first class product and well received - that was developed with a Teensy LC?
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    Hello, I thought I would weigh-in, since I've...

    Hello, I thought I would weigh-in, since I've been looking at MIDI IN/Out/Thru recently. I think a buffer between the MIDI In and Out/Thru with an enable is all that is needed and simpler. I think a...
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    Use the latest V2.03 version of the firmware and...

    Use the latest V2.03 version of the firmware and NOTHING else. Also please email the developer of TSynth directly, who'll be delighted to help over email.
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    You could use one of these MPR121 I2C breakouts:...

    You could use one of these MPR121 I2C breakouts: https://www.adafruit.com/product/1982

    Cheaper copies are available...
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    Hello. Very nice presets. It would be great if...

    Hello. Very nice presets. It would be great if you made the code open source, so I can take the oscilloscope code, if and when you improve it. Presets #24 and #58 were designed to be held, by the...
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    Hello, if it sounds like a digital noise, is it...

    Hello, if it sounds like a digital noise, is it from the code? Does the noise appear on USB digital audio output if you add a USBAudio object and compile with Audio?
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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?
  43. 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.
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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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