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    Watch this guy's videos:...

    Watch this guy's videos: https://www.youtube.com/c/NotesAndVolts/videos
    This one in particular:https://www.youtube.com/watch?v=VejO8rDdhzo
  2. Thread: lfo phase reset

    by UHF
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    This has come up several times before on the...

    This has come up several times before on the forum. Have a look here: https://github.com/ElectroTechnique/TSynth-Teensy4.1/tree/master/TSynth You need to set the phase_accumulator to zero by adding a...
  3. This is also known as keyboard tracking, it's...

    This is also known as keyboard tracking, it's discussed from #11 here: https://forum.pjrc.com/threads/67218-Filter-Tracking-with-Resonance-issue
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    Hello again. :D I've received a new Teensy...

    Hello again. :D I've received a new Teensy MicroMod and it works on both ATP board and my PCB. The other one failed in an odd way, refusing to work on all my PCBs immediately and then after a couple...
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    It started failing on the ATP board yesterday and...

    It started failing on the ATP board yesterday and today. The MM isn't visibly damaged, I've looked at both sides under a stereo microscope.

    Just now, I've managed to get it programmed by using the...
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    I'm getting the same problem with the TeensyMM on...

    I'm getting the same problem with the TeensyMM on the ATP board now. When plugging in, the Serial USB is not present in Arduino IDE and a simple Blink program fails to run. Pressing Boot on the ATP...
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    Hello Kurt, a) Yes multiple times. b) I've...

    Hello Kurt,

    a) Yes multiple times.
    b) I've checked around the board and the pins on the M.2. USB to the M.2 isn't shorted.
    c) Yes, those are fine.
    d) I've tried a separate power supply and...
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    Thanks for the help Paul. I tried a tantalum...

    Thanks for the help Paul. I tried a tantalum instead and still no change. I put a scope on the 3V3 while it was attached to a pc and got this, which doesn't look particularly worrisome:

    26361

    I...
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    Yes, it's four layer: signal, GND, 3V3, signal....

    Yes, it's four layer: signal, GND, 3V3, signal. I've tested the voltages and GNDs on the M.2. I've removed and bypassed USBLC6 and soldered a new USB micro connector direct to pads 4 and 6 as seen in...
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    Hello, I've spent some time troubleshooting my...

    Hello, I've spent some time troubleshooting my problem with USB and I've come to the conclusion that there's nothing wrong with the PCB or the track routing. I'm suspecting it's the power-on...
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    Hello, I'm still hitting a brickwall with this. I...

    Hello, I'm still hitting a brickwall with this. I get the following log produced by Teensyduino 1.55 when I plug USB in:


    20:53:41.537 (ports 2): WM_DEVICECHANGE DBT_DEVICEARRIVAL
    20:53:41.537...
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    If I apply 5V directly to the PCB, sometimes the...

    If I apply 5V directly to the PCB, sometimes the TeensyMM operates and the LED blinks. Is there some start-up conditions not being met? I think all my GNDs are GNDed. Capacitance problem?
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    I tried the Blink program and there's no flashing...

    I tried the Blink program and there's no flashing LED, so the TeensyMM simply isn't running.

    By the way, this is the extent of technical support on Sparkfun's dedicated Micromod forum:...
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    Other than GND, 3V3 and VBUS power and the USB,...

    Other than GND, 3V3 and VBUS power and the USB, are there any other mandatory connections? I haven't connected BATT_VIN/3, this is only needed if an ADC is being used? I think this pin can be used as...
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    Detail of USB micro B to MicroMod. There is a...

    Detail of USB micro B to MicroMod. There is a USBLC6 IC to protect the MicroMod - I removed this and bypassed it which made no difference.
    26266
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    I have the same problem. I've made a prototype...

    I have the same problem. I've made a prototype carrier board with USB micro B. I'm getting either no recognition of the TeensyMM, USB unrecognised or the "SE Blank RT Family" problem. Putting the...
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    Digikey are fine and offer much the same.

    Digikey are fine and offer much the same.
  18. I bought one of these...

    I bought one of these a while ago and it works fine except I need to set
    tft.invertDisplay(true); but the display used on the PCB looks the same as yours. Can you post a photo of how it looks with...
  19. It's often the case that the displays they fit to...

    It's often the case that the displays they fit to the PCB have differences between them that aren't apparent when you buy them. There are IPS 160x80 SPI displays I use that have colours swapped and...
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    Anyone who worked on TD1.54 perhaps?

    Anyone who worked on TD1.54 perhaps?
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    Teensy MicroMod SPI1

    Hello, does SPI1 on Teensy MicroMod function or is it SDIO only? Something's not working for me. Thanks.

    From SparkFun:

    The Teensy Processor has two SPI ports. The primary SPI connects to the...
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    I used this wavetable method in the T3.6 version...

    I used this wavetable method in the T3.6 version of my synth for sawtooth and square waves, and found they sound better than the non-bandlimited alternative:
    ...
  23. I had this last August 2020 as I live in South...

    I had this last August 2020 as I live in South Korea. I was required to fill in an online form about how it was going to used (in my prototype death ray aimed at obliterating continental America,...
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    Hello, can I ask what the current status of...

    Hello, can I ask what the current status of Teensy Micromod is? Are we waiting for Sparkfun? Is it chip shortages?
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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...
  30. 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...
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    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...
  41. 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...
  49. 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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