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thanks, hadn't thought of that. do you know why specifically it's 2^30? interested in where this range was calculated (2^27.7 to 2^30.5 in the teensy's SVF's case).

Sorry to revive a dead thread, but today I've been looking into exactly this. Removing the state variable filter's Q limit of 5.0 and pinging the filter with a quick transient does result in long sinusoidal ringing --- the length of this tail can be adjusted pretty audibly between 5.0 and...

Hi Neal, I read the CV separately on a different analog input PCB that sums a panel potentiometer and the incoming CV signal. 5 channels are read and multiplexed on this PCB, the output of which is being read by one of the Teensy's analog read pins. I've found this works well (this is an early...

Sure! I'll finish up the build and get some documentation together.

Thanks, Paul. I'm sure this has been accomplished by now, but this fix means I have a functional Teensy 4.1-based breakout board for eurorack modular synth levels --- multichannel audio I/O and CV input. If it's of interest to anyone, I will gladly upload the PCB and schematic to github. I owe a...

Never mind --- after confirming it was a hardware issue, I replaced the CS42448 chip and it all works like a charm.

Hello, I'm having a bizarre issue with a custom audio board running a CS42448 codec. After assembling the board, I got external audio on the TDM inputs running to USB audio just fine, then waveforms in the audio designer running to the TDM outputs as well. I'm trying to combine them now and...

av500, this just completely saved my project --- I'd almost given up after several late nights of trying to debug the hardware. Paul --- you are a saint for including the link to this thread in the .cpp file! strangely enough, this issue has happened with every one of the three CS42448s I've...

hi paul! apologies for delay (ha), i've had computer troubles and had to migrate machines. in regards to "clean" feedback, here's a sample from my implementation in maxmsp that i've been working to recreate: https://soundcloud.com/ro-web/tapedelay-clean-feedback/s-dJM5JA2CtJq when i said...

oh, yes apologies! https://soundcloud.com/ro-web/delay10tap-feedback/s-teUMz6ldgry

Hi Paul, Sure, here's an audio sample. https://soundcloud.com/ro-web/delay10tap-feedback The setup is the same as in the example you posted: AudioConnection patchCord1(i2s_in, 0, mixer1, 0); AudioConnection patchCord2(i2s_in, 1, mixer1, 1); AudioConnection patchCord3(mixer1, delay1)...

One question for now --- do you know what causes the repeats in the feedback loop to continue to be pitch shifted? e.g. the delay feedback audio becomes far higher (or lower) in pitch than the delay object's initial output.

Hi @houtson, This is spot-on-the-mark exactly what I had in mind. Many, many thanks for an excellent implementation! I noticed that, after adjusting the parameter, the pitch hops back to regular speed fairly rigidly, so I added the same lowpass / interpolator-feedback function from my program...

Hi Paul, Fantastic! I've had a great time working with your code. I'd love to see what you've come up with when it comes to pitch modulation. Looking forward!

Fantastic work! Looking forward to playing with this!

Been having fun with this pseudo-version in the past few days - if anyone is interested in an updated version, feel free to PM. I'm thinking now about how this could be implemented within the delay object. Stepping through logically --- with a fixed sample rate, stepping through the numbers 0-9...

I did some (very fun!) exercises in approximating the effect I'm looking for without modifying the sample rate, using existing objects. When playing with tape delays, it seems that the amount of pitch shift has to do with the delay parameter's rate of change rather than the absolute value. This...

Forgive the revival of a dead thread, but I've been looking into this a little and am hitting a roadblock --- specifically for adding doppler shifts when modifying delay times (that classic tape-like pitch modulation when quickly changing delay time). I've been able to successfully reproduce...

From my understanding, the 12bit resolution advertised in the datasheet is more of a theoretical maximum --- in any practical situation, the noise introduced eliminates those two LSB. After smoothing and averaging, best you can reliably hope for in a prototype setting is 10 bit. Please correct...

fantastic work, baloran! looks amazing!

hi benwadub, looks like basically what you're doing is this: float cutoffknob = analogRead(A3); filter1.frequency(cutoffknob); analogRead(A3) will return the raw ADC value, and that probably won't match perfectly to a frequency range you're looking for. If you're reading it at 10 bit...

Many thanks for that, defragster. Saved me some headaches. for anyone looking to source the correct kind of 8MB PSRAM chips in europe, pimoroni.com stocks them (as well as the T4.1).

Same question led me to do some digging on mouser, and it looks like they started offering this new SRAM chip in SOIC-8. It's only 4MB (and more expensive than PJRC's offerings) but it looks to me to have identical pinouts and instruction commands. Is there anything else that would disqualify...

Confirmed overrun and underrun of your code after a few minutes on a macbook pro, OSX 10.13.6. I'm also having problems with highly audible clicking at regular intervals running any USB audio on the 4.0, on four different audio monitoring programs (Audacity, AudioMonitor, AudioHijack, Ableton...

also - has it been alright to use the inverted VQ as a bias for inputs? e.g. have you noticed problems with this as of yet?

fantastic work and thanks for sharing. do you mind outlining how you disabled the HP filters in control_cs42448? also - did the DC signals pass with single-ended inputs below the full-scale input levels? were the problems specifically as they approached maximum levels, and is that something that...

Hi All, Having an absolute blast using the audio designer. It's fantastic! I'm working on a project that uses a bank of bandpass filters and I'm trying to figure out a good way to allow them to self-oscillate. I'm testing with white noise on the input so I can hear their responses clearly...

Paul, this is perfect! Thank you!

Hey all, I’m trying to work a clock/trigger signal input in to my project. Couldn't find anything using search - hope this hasn't been already solved somewhere else. This originally worked as rough-style “tap tempo” code with a button, and I figured the same concept could be used to calculate...

much success with multiple outputs running with elapsedMillis ! nonetheless now i'm curious about timer peripherals, sounds like there could be some interesting applications there...

Paul - fantastic advice, this rules and simplifies a lot of things. Is there additional hardware that could be hooked up for the teensy to support more timers for PWM?

Hi all, Long time reader, first time caller. Been using teensy for about a year now (thanks Paul, incredible device), mostly for fairly simple tasks. I'm diving into a new project now- it involves sending 8 (<10kHz) clock outputs, each with variable speed control from a front panel. I'm coming...