Deck A
SoundCloud
no track
Paste a public SoundCloud track URL
Deck B
Spotify
not connected
Connect Spotify, then search a track
SC
SP
Deck A uses the SoundCloud Widget API. Deck B uses Spotify Web Playback SDK and needs Spotify Premium.
Deck B supports track or playlist URLs (open.spotify.com) in addition to search.
The crossfader blends platform volume only; protected platform streams cannot share raw waveform, EQ, or scratch audio.