Code a Wavetable Synth with Python in 6 Minutes Tutorial [Synth

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Hi, my name is Jan Wilczek and I am an audio programmer and a researcher. Welcome to WolfSound!
WolfSound's mission is to provide high-quality, informative, and entertaining videos, articles, and courses on how to process sound by exploring mathematics, applying algorithms, and creating code in various programming languages. Topics include sound synthesis, digital signal processing, programming languages for audio (C, C++, Python, Rust), and audio effects. I am also sharing tips on how to learn fast and effectively. Make sure to visit www.thewolfsound.com/.
WolfSound enables everybody to learn about audio programming!
In this video, we are implementing the wavetable synthesis algorithm (a wavetable synthesizer) in Python. We deal with wave table generation, wave table looping, linear interpolation of samples, gain application, fade-in, and fade-out. Ultimately, we obtain a sine generator and a sawtooth generator. To implement the code in this video, you need just Python, a text editor (IDE), and SciPy and NumPy Python packages.
In case of any doubt in understanding, please, refer to the article above or ask a question in the comments 🙂
Note: The gains of the generated sines are not 0 dB and -20 dB respectively. I have adjusted them during editing so that the video is more pleasant to listen to. However, if you generate them with the presented code, you will get the described effect.
ABOUT ME
My name is Jan Wilczek. I am an audio programmer, a researcher, a musician and currently a student of the Elite Master's Study Programme Advanced Signal Processing and Communications Engineering at University of Erlangen-Nürnberg. Additionally, I am a visitng student at Aalto University in Finland, where I put finishing touches on my master thesis under the supervision of prof. Emanuël Habets, prof. Vesa Välimäki, and Alec Wright.
TIME CODES
00:00 Introduction
00:33 Packages import
01:06 Processing parameters
01:34 Wave table generation
02:53 Looping over the wave table
05:38 Storing the output in a .wav file with SciPy's wavfile
06:26 Sine generated with 0th-order interpolation
06:54 Adjusting the gain of the generated signal
07:59 How to reduce noise in wavetable synthesis?
08:34 Linear interpolation implementation
12:43 Sine generated using linear interpolation
13:10 Fade-in and fade-out implementation
15:52 Sawtooth generation
17:48 Summary
#python #synthesis #sound

[@WolfSoundAudio]

Have I helped you with this video? If yes, please, consider buying me a ☕ coffee at www.buymeacoffee.com/janwilczek Thanks! 🙂

[@iesusdesus5704]

I was able to make a sawtooth and even a square wave sing Daisy Bell. Thanks so much for the tutorial! :)))))

[@WolfSoundAudio]

That's awesome, thanks for sharing!

[@FleshChopper]

Just came across your videos and your blog. Thank you, thank you, thank you! I am a hobbyist and was looking for some sort of organized method of exploring audio coding, and here it is! Wonderful!

[@WolfSoundAudio]

Thank you for writing that! I love to hear that :)

[@DavidMood]

amazing . please please make more videos like this

[@sanjaux]

Finally following along with these in cmajor and it's been great! These videos are so helpful

[@WolfSoundAudio]

Thanks 🙂

[@PeVoNZ]

Really well explained, thank you so much!

[@WolfSoundAudio]

Thanks a lot!

[@JuhinPavithran]

Thank you

[@spectralknights2]

Just found your nice channel. Thanks for the tutorials👍 Pls do more Python audio coding tutorials ☺️

[@WolfSoundAudio]

Great to hear! Have you seen my latest lowpass/highpass filter in Python video?

[@BrianMendoza93]

Thank you! This tutorial really completes the previous video. It would be a great idea to create an audio course in this format, where you explain the topic and then the code implementation. (C++ or Python)

[@WolfSoundAudio]

Thanks, Brian! That's a great idea! On which topic would you like to have a course the most?

[@streetware-games]

awesome videos

[@przekladanki]

Quel entourage ! :D

[@Teddy0567]

Thank you so much, I used the code in this video to understand the basics, I'm looking to create a simple synthesizer GUI with amplitude sliders for harmonics to mess around with different waveforms, would be nice to visualize the waveform and an EQ as well in real time so I've got myself a challenge!

[@WolfSoundAudio]

Awesome, thanks for sharing and good luck!

[@Teddy0567]

@@WolfSoundAudio Thanks for your wishes! I've got most of this now bar the FFT EQ, it's really cool to see the waveform change when adding harmonics. Although each time I play a sound I first generate the whole array for a duration to then be played by the sounddevice library. This has 3 problems; 1: it's monophonic (threads don't work with sounddevice output), 2: there is no option to decide the length of the note by holding a key or button, 3: there is severe input delay as the key is not directly bound to a loop of the wavetable. Have you encountered this problem before and/or have you used library's that allow you to directly connect (midi) input with looping of the wavetable? This would allow me to create amazing additions such as ADSR envelopes.

[@TanguyLissenko]

Hello sir, thank you for this video. Could you explain the benefit of the wavetable beside computing the sin function each time ? We still have the problem of being limited in memory in the duration of the waves generated. Or is it not the purpose of a wavetable in the first place ?

[@flywittzbeats4008]

This is amazing, it’s the same complexity, just a fraction of the time. numpy speeds up runtime by converting to machine code right?? Thanks!

[@michele709]

I’m struggling to make a Matrix with the pyo library. What i would like as a result is a wavetable with a “continuous” interpolation among these tables: triangle, saw, square, square with variable duty cicle. Do you have any advice?

[@haoheliu1425]

Thank you soooo much! This tutorial save my ass!

[@WolfSoundAudio]

Haha, glad to hear that!

[@SiggeSvahn]

I failed in the language PureBasic to receive SYSEX DUMP from my hardware synth. Have you had any luck doing that in Python?

[@sergiomax1607]

how to make a dll vds module for my mulab sequencer station ?

[@WolfSoundAudio]

I'm sorry, I don't know :(

[@illusrecords2674]

Just getting into coding pardon this noob question but what program are you using to write this code?

[@WolfSoundAudio]

Visual Studio Code :)

[@leonardofuegofierro]

Well if that isn't a nice workstation. Great video!

[@WolfSoundAudio]

Thank you! I completely agree :)

[@agent007asdfgh]

Hi, Do you know how to make modular synthesizer?

[@WolfSoundAudio]

Yes, i do :)

[@agent007asdfgh]

@@WolfSoundAudio please make video of coding modular synthesizer

[@dirkschiller1637]

Could not find the code on your website nor on github. In minute 18:05 you mention there is code on your website. Maybe you could link it. Thank's a lot!

[@WolfSoundAudio]

It's the first link in the description, here you go: thewolfsound.com/sound-synthesis/wavetable-synth-in-python/

[@dirkschiller1637]

@@WolfSoundAudio Wow 😮 Didn't see it - fast reader. Thank you a lot 🙏

[@WolfSoundAudio]

@@dirkschiller1637 No problem 😉

[@taehak]

please do more video python synthesizer please like envelopes and filters and any other thing plsplspls

[@WolfSoundAudio]

Sure, I will!

[@user-nh7hk9hu9g]

Could you please tell, why wavetable is 64?

[@WolfSoundAudio]

No particular reason. For lengths that are powers of 2, you can do the index wraparound using a bit mask instead of the modulo operation, which is faster.

[@user-nh7hk9hu9g]

@@WolfSoundAudio thank you!

[@agent007asdfgh]

Hi

[@pedrozuniga8296]

rajate con el código pa la otra sipo

[@WolfSoundAudio]

¿Para qué? No entiendo.

[@OMNI_INFINITY]

Watching a software engineering video posted by a guy that can’t count. How many minutes?

[@CHITUS]

Quel entourage ! :D