# Legacy Audio

- [Input Audio Follow Video](/automate/osc/messages/legacy-audio/input-audio-follow-video.md): Sets the AFV state for the selected legacy audio source.
- [Input Gain Adjust](/automate/osc/messages/legacy-audio/input-gain-adjust.md): Increments or decrements the level for the legacy audio source's input gain. This method is to be used on switchers that do not support Fairlight Audio.
- [Input Gain Set](/automate/osc/messages/legacy-audio/input-gain-set.md): Sets the level for the legacy audio source's input gain. This method is to be used on switchers that do not support Fairlight Audio.
- [Input Mix Option](/automate/osc/messages/legacy-audio/input-mix-option.md): Sets the mix option for the selected legacy audio source. This method is to be used on switchers that do not support Fairlight Audio.
- [Input State](/automate/osc/messages/legacy-audio/input-state.md): Sets the on or off state for the selected audio source.
- [Master Gain Adjust](/automate/osc/messages/legacy-audio/master-gain-adjust.md): Increments or decrements the level for legacy audio master gain. This method is to be used on switchers that do not support Fairlight Audio.
- [Master Gain Set](/automate/osc/messages/legacy-audio/master-gain-set.md): Sets the level for the legacy audio master gain. This method is to be used on switchers that do not support Fairlight Audio.
- [Monitor Enable](/automate/osc/messages/legacy-audio/monitor-enable.md): Sets the enabled, mute, and dim settings on switchers such as the ATEM 2 M/E Production Studio 4K and ATEM 4 M/E Broadcast Studio 4K.
- [Monitor Gain Adjust](/automate/osc/messages/legacy-audio/monitor-gain-adjust.md): Adjusts the gain on the monitor output for the ATEM Television Studio HD, ATEM Television Studio Pro HD.
- [Monitor Gain Set](/automate/osc/messages/legacy-audio/monitor-gain-set.md): Sets the gain on the monitor output for the ATEM Television Studio HD, ATEM Television Studio Pro HD.
- [Headphones Gain Adjust](/automate/osc/messages/legacy-audio/headphones-gain-adjust.md): Adjusts the gain on the headphones monitoring on the ATEM Television Studio HD, ATEM Television Studio Pro HD.
- [Headphones Gain Set](/automate/osc/messages/legacy-audio/headphones-gain-set.md): Sets the gain on the headphones monitoring on the ATEM Television Studio HD, ATEM Television Studio Pro HD.
- [Solo](/automate/osc/messages/legacy-audio/solo.md): Solos a source on legacy ATEM switchers.