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# Other options

There are a few other, lesser used, options available. These are shown in Table 29.

Table 29 Other defines
Define | Description | Default
--- | --- | ---
`XUA_USB_EN` | Allows the use of the audio subsytem without USB | `1` (enabled)
`INPUT_VOLUME_CONTROL` | Enables volume control on input channels, both descriptors and processing | `1` (enabled)
`OUTPUT_VOLUME_CONTROL` | Enables volume control on output channels, both descriptors and processing | `1` (enabled)
`XUA_CHAN_BUFF_CTRL` | Enables event based communication between XUA_Buffer_Ep() and XUA_Buffer_Decouple() which significantly reduces power consumption (approx 40 mW on xcore.ai) at the cost of consuming two extra channel-ends. Consequently this option may not be viable on some high end configurations which feature multiple digital interfaces such as SPDIF or ADAT. | `0` (disabled)