metronome | friendlier front-end

I want to build a simple metronome app using AVAudioEngine with these features:

• Solid timing (I know, I know, I should be using Audio Units, but I'm still struggling with Core Audio stuff / Obj-C wrappers etc.)
• Two different sounds on the "1" and on beats "2"/"3"/"4" of the bar.
• Some kind of visual feedback (at least a display of the current beat) which needs to be in sync with audio.

So I have created two short click sounds (26ms / 1150 samples @ 16 bit / 44,1 kHz / stereo wav files) and load them into 2 buffers. Their lengths will be set to represent one period.

My UI setup is simple: A button to toggle start / pause and a label to display the current beat (my "counter" variable).

When using scheduleBuffer's loop property the timing is okay, but as I need to have 2 different sounds and a way to sync/update my UI while looping the clicks I cannot use this. I figured out to use the completionHandler instead which the restarts my playClickLoop() function - see my code attach below.

Unfortunately while implementing this I didn't really measure the accuracy of the timing. As it now turns out when setting bpm to 120, it plays the loop at only about 117,5 bpm - quite steadily but still way too slow. When bpm is set to 180, my app plays at about 172,3 bpm.

What's going on here? Is this delay introduced by using the completionHandler? Is there any way to improve the timing? Or is my whole approach wrong?

Thanks in advance! Alex

Recently I've been trying to figure out how to write a metronome app, but I've come across many difficulties with OS time control (calling functions e.g.) or significantly inaccurate onset detection algorhithms (I've used librosa) and it seems to be a pretty complicated topic. Yet for some reason I wasn't successfull in my research upon professional metronome apps source code/tutorials/books touching the topic etc... The web seems to be filled with amateur examples and solutions that don't really meet the modern metronome app (such as Frozenapes iOS Tempo app) standards. e.g. a metronome which uses pre-recorded .wav samples when a certain tempo is called (so there are all the tempos between 30 and 300 bpm stored in the app). That kind of solutions seem to be a bit of dead end if user wants to change the tempo while metronome is working. To sum it up - I'm looking for any professional resources with code/text/whatev which isn't 2000 pages signal processing book for math graduates and could help me with designing a decent metronome with some recording features.

I'm trying to write a simple metronome with librosa.clicks

I'm trying to write a python based metronome with librosa and sounddevice but I've came across some problems with it's accuracy. Here's the code:

I am new to AudioKit and programming music app. I'm building a metronome app and using AudioKit's AKMetronome. I want to have a feature where a user can specify a sequence of beat patterns with different tempo. But I find it is inaccurate to use apple's DispatchQueue.

I'm thinking of rewriting the metronome using AKSequencer. Is there a way to use AudioKit's sequencer to change tempo on the fly or generate a sequence with multiple different tempo? (Sequencer example: https://github.com/AudioKit/Cookbook/blob/main/Cookbook/Cookbook/Recipes/Shaker.swift)

Thanks for AudioKit!

I'm a beginner in Swift and AudioKit, so this may be an easy question:

I want to build a metronome app. From the example in Audiokit's new CookBook and the old AKMetronome(), I can see how to build a simple metronome using AudioKit. But I don't know how to play beats with compound time signatures (3/8, 7/8, etc.). Both examples here use a time signature with 4 as a fixed bottom number and the top number can be changed (i.e. we can have 1/4, 3/4, 6/4 but not 3/8, 6/8).

Is there a way to change the bottom number?

Link for AKMetronome: https://audiokit.io/docs/Classes/AKMetronome.html#/s:8AudioKit11AKMetronomeC5resetyyF

AudioKit Cookbook's Shaker Metronome: https://github.com/AudioKit/Cookbook/blob/main/Cookbook/Cookbook/Recipes/Shaker.swift

I'm trying to make a visual metronome of sorts in which I press a button in order to change the bpm. Once the bpm is 85, if the button is pressed once more, if goes back to the default bpm (of 120). t this is my code:

I tried to make a metronome using HTML and JS. I know the audio can't autoplay due to restrictions (I don't want it to anyway), so I placed an element with a inside, with all (I thought?) appropriate attributes; I controlled playback using JS triggered by a button click. This works on my laptop and even in the XBox Edge browser, but on iOS browsers (both Safari and Firefox) the sound does not play. The HTML looks like this:

I'm working on a timer that needs to do some calculations and run some functions at a certain interval. I'm trying to keep the interval as big as possible, but I need it to be kind of fine grained.

Here is the periodic timer with some of the stuff that needs to happen. So as you can see, every second (the milliseconds passed % 1000 == 0) it will do some stuff if some conditions are met. But also every 10 milliseconds I need to check some stuff.

It seems this is a bit too much, and after running the timer for 2 minutes it already drags 1 second behind. I guess I'm approaching this the wrong way. Could/should I somehow put all that logic in a function that just runs async so the timer can just keep going.

It's not the end of the world if the timer display drags for a few milliseconds every now and then, if it catches up later. But now the whole timer just drags.