Here's the list of devices with the number of channels reported on my system (when using PulseAudio): As you can see, for direct hardware devices like hw:*, this is the actual number of audio channels supported by that device, e.g. Same on PulseAudio's "default" device with 32 channels. You can always update your selection by clicking Cookie Preferences at the bottom of the page. By clicking “Sign up for GitHub”, you agree to our terms of service and And then it works. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. You can think of each orbit as an audio output, with its own set of global effects (by default, reverb and delay). http://supercollider.sourceforge.net/wiki, The Theatre Sound Colloquium (and thoughts on sound design) | Designing Sound Designing Sound, Post window (shows the outcome of your code, including any errors), Generating one hit sfx for weapon fire, footsteps, metal impacts, Varying the intensity of wind, running water, ambient drones, Changing the dynamics of a generative music piece, Browse code snippets and submit your own –. All content on Designing Sound is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. If you turn off PulseAudio and use ALSA directly, you can tell SC to use one of these hardware devices. Hence this issue to get things clarified.). The user should be able to select two devices for duplex audio using the same interface supported in MacOS: What should SuperCollider do when PortAudio reports 32 or 128? These virtual devices claim to have 32 channels for input and output. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Same on PulseAudio's "default" device with 32 channels. BufRateScale is vital because the soundfile I've loaded is actually at 11025Hz sampling rate, and my audio output is at 44100Hz - so it adjusts for different possible sampling rates. .ar, as always in SuperCollider, means we want audio rate output, i.e., sound. But to make things more confusing, scsynth's default number of output channels when started from the command line is 8, as defined in SC_WorldOptions.h. ALSA without PulseAudio will also provide a virtual device called "default", which claims to have 128 channels for input and output. 2 or 8? What is a sane fallback value if the number of channels is obviously (?) Besides correcting the output issues I was having with Supercollider ASIO4ALL can also dramatically improve the latency on your audio system. When on ALSA's "default" device, SC_PortAudioDriver will request an output stream of 128 channels from PortAudio and later write to it, yet audio output remains completely silent. When starting sclang and doing s.boot, it will start scsynth with the default values from Server.sc and use 2 channel input and 2 channel output. ... //this loads into a buffer the default sound that comes with SuperCollider The PortAudio library is using the ALSA API. We pass in just one argument, mul, which stands for “multiply.” SuperCollider will multiply the output from the PinkNoise UGen by the value of mul. The BufFrames UGen returns, well, the number of frames in the soundfile. SC with PortAudio is known to work fine on Windows, where it is SC's default audio driver. And why? Googling, I found this mailing list thread, which wasn't really helpful, it only seems to say "don't worry about 128 channels, that's an artefact of ALSA's API, just default to stereo when requesting output and you'll be fine". The following example comes from a MacBook Pro:Server.default.options.inDevice_("Built-in Microph");Server.default.options.outDevice_("Built-in Output"); In case of a dedicated audio interface, you might need to specify a single device, e.g.Server.default.options.device_("MOTU 828"); On macOS you c… they're used to log you in. Already on GitHub? to your account, while trying to debug the PortAudio driver, I'm getting increasingly confused about the concept of input and output channels when it comes to scsynth and audio hardware. If I patch SC_PortAudio.cpp and force mInputChannelCount = 2 in line 375 and mOutputChannelCount = 2 in line 384, things mostly work. By default the server will boot to your system's default audio devices. You signed in with another tab or window. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Due to the advanced nature of SuperCollider, the text assumes that you have a basic knowledge of how to work with Ardour. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. Learn more. PortAudio: What is an audio output channel and why use 32 or 128? Sign in Instead, a normal user is meant to use the PulseAudio's ALSA emulation device, which provides "default" and "pulse" and offers the benefits of the PA system, e.g. {SinOsc.ar(440, 0, 0.1, 0)}.play; As a result, I'm now confused about the meaning of channels when it comes to PortAudio and SuperCollider. 2 input and output channels for hw:1,0. Have a look at SuperDirt's documentation, in particular the example superdirt_startup.scd file. What does it even mean if PortAudio reports 32 or 128 "channels" for the default audio device, even if the actual hardware is only 2 channel stereo? You'll want to paste the setup code into the supercollider editor window. Millions of developers and companies build, ship, and maintain their software on GitHub — the largest and most advanced development platform in the world. I'm trying to use SuperCollider with the PortAudio driver on Linux. To put it simply, UGens take inputs and use them to produce sound. We’ll occasionally send you account related emails. After digging into the source of SC_PortAudio.cpp, here's an oddity I found: The audio driver sets mInputChannelCount and mOutputChannelCount to the number of channels reported back by PortAudio's Pa_GetDeviceInfo(). And that 's what Server.sc seems to be wrong 384, things work... The setup code into the SuperCollider editor window 2 in line 384, things mostly work SuperCollider.... Select two devices for duplex audio using the same interface supported in MacOS: in! Free GitHub account to open an issue and contact its maintainers and the community simply, take. 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