ASIO Device Capture

ASIO Device Capture input properties for Script Engine. Captures audio from a professional ASIO sound device installed on the host machine. ASIO (Audio Stream Input/Output) is Steinberg's professional driver standard, designed for low-latency, high channel-count audio capture and playback — typically used with audio interfaces from RME, MOTU, Universal Audio, Focusrite, and similar manufacturers. Pick one of the installed ASIO devices, choose how many channels to capture and which channel to start from, and the input feeds those channels into Composer's audio pipeline. ASIO is a Windows-only driver standard.

Property	Type	Access	Description
`ShowAdvancedOptions`	`bool`	`get/set`	Show or hide the input's advanced settings in the editor UI. [default=false].
`AvailableASIODevices`	`StringCollectionEnum`	`get/set`	Picker listing the ASIO devices installed on the host machine. Populated automatically from the available ASIO drivers on startup. Pick one to capture from. The list always begins with `Select Device` as a placeholder — no audio is captured until a real device is chosen. If the expected device isn't listed, make sure its ASIO driver is correctly installed on Windows.
`OpenAsioControlPanelCommand`	`Command`	`get/set`	Open the selected device's own ASIO control panel. Most ASIO drivers ship with a vendor-specific control panel for setting buffer size, sample rate, channel routing, and other device-level options. This command launches it so you can adjust those settings without leaving Composer. Only works when an ASIO device is currently selected.
`AsioStatus`	`MediaPlayerState`	`get`	Current playback state of the input (read-only). Reflects whether the input is `NoMedia` (no device selected), `Playing` (capturing audio), `Stopped`, or in an error state. Driven indirectly by `StartCommand` / `StopCommand`, by `AutoStart` at load time, and by the device selection.
`StatusMessage`	`ASIODeviceState`	`get`	Detailed status of the selected ASIO device (read-only). More specific than `AsioStatus` — describes what the device itself reports (driver loaded, ready, capturing, error, etc.). Useful for surfacing device-level problems such as "driver not installed" or "device in use by another application".
`StartCommand`	`Command`	`get/set`	Start capturing audio from the selected ASIO device.
`StopCommand`	`Command`	`get/set`	Stop capturing audio from the ASIO device.
`AutoStart`	`bool`	`get/set`	Whether the input starts capturing as soon as the project loads. [default=false]. When true, the input invokes its start logic immediately on load (equivalent to running `StartCommand`). Auto-start is suppressed for the first few seconds after the input is added to a project, so you can finish configuring the device before it goes live.
`TotalChannels`	`int`	`get`	Total number of audio channels the selected device exposes (read-only). Reported by the device's ASIO driver when a device is selected. Sets the upper bound for `ChannelOffset` and `ChannelsOut` — for example, an 8-channel interface gives a value of 8.
`ChannelOffset`	`int`	`get/set`	First channel to capture, counting from 1. [min=1, max=TotalChannels, default=1]. Set to 1 to start from the device's first input. Increase to skip past channels you don't want — for example, on a 16-channel interface set this to 9 to capture from inputs 9 onward. Combined with `ChannelsOut` to define the captured range.
`ChannelsOut`	`int`	`get/set`	How many consecutive channels to capture, starting from `ChannelOffset`. 1 captures a single channel (mono); 2 captures two consecutive channels (stereo); higher values capture multiple channels for surround or multi-track productions. The value is automatically clamped so `ChannelOffset + ChannelsOut - 1` never exceeds `TotalChannels`. Updating this also refreshes `SelectedChannels` for display.
`SelectedChannels`	`string`	`get`	Human-readable description of the captured channel range (read-only). Updated automatically when `ChannelOffset` or `ChannelsOut` changes — for example "channel 1" for a single channel, or "channel 1 to 8" for a multi-channel range. Useful for confirming the configured capture range at a glance.

Inherits from: AbstractInput, AbstractAudioProcessing, AbstractAudioMetering.

See also: ASIO Device Capture in Inputs — user-facing introduction, screenshots, and section summaries.