Do you mean you want to merge audio sources onto another, using real-time 
commands, mimicking pushing buttons on a soundboard to insert sound effects 
(e.g. https://www.youtube.com/watch?v=KLANLzerfa0)?

Or do you want to overlay another track on a scheduled basis?  For that, I 
would do:
`# insert station IDs at xx:59:45 over then-playing content
normal_ids  = audio_to_stereo( id="id_normal", playlist (id="id_playlist", 
mode="random", reload_mode="watch", "/var/audio/IDs/"))

feed_main = audio_to_stereo(## your main input.source e.g. input.http, 
playlist, etc ##)

combined_out  = smooth_add(
        normal=feed_main,
        p=0.30,
        special=switch([
        ( { 59m45s }, normal_ids )
        ])
)
`
This ducks your `feed_main` source to 30% and overlays the ID/jingle at the 
specified time.


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