#### `freq`

Frequency of test signal. The sample rate needs to be at least 2 times higher.

Value type: #gdouble

See #audiotestsrc:freq

#### `mute`

mute channel

Value type: #gboolean

See #volume:mute

#### `volume`

volume factor, 1.0=100%

Value type: #gdouble

See #volume:volume

#### `volume`

Volume of test signal

Value type: #gdouble

See #audiotestsrc:volume