The ASIO renderer filter can only be used as the last filter in an output graph. It outputs the audio data to the specified ASIO device.

JSON Structure

	"name": "ASIO Renderer",
	"device": {
		"name": "...",
		"channels": "..."
	"format": {
		"sampleRate": "...",
		"resolution": "..."

Defines the ASIO device and channels to use.

  • name: Name of the device as defined by the device's driver. It is sufficient to specify only a part of this string in the name field, as long as it is unique to the device.
  • channels: A comma-separated list of channel numbers (0-based). E.g., "0,1" will play two channels on the 1st and 2nd output channel of the device.

Describes the audio format, which is to be written to the device.

  • sampleRate: Sampling rate in Hz. The supported values depend on the device. Most devices support at least 44100 and 48000 Hz.
  • resolution: Bit width of a single audio sample. The supported values depend on the device. Most devices support 16 and 24 bit audio.


  • The "name" of a given ASIO device is not always obvious. ROAD's devices API can enumerate the names of all installed ASIO devices, as well as the number of channels they offer.
  • There is no need to specify a channel count in the "format" data, because this is implicitly defined by the number of entries in the "channels" list of the device specification.
  • The specified format should usually match the format specified for the output graph. Otherwise, ROAD might try to insert automatic conversion of sampling rate and/or resolution, but this could fail. Also, the number of channels in the device specification's channel list must match the number of channels given in the graph's format.