Why Club Ready Music intros and outros are vocal-free

Club Ready Music keeps the intro and outro of every track free of vocals because that is where a DJ mixes. Two records overlapping with two singers is a clash; two records overlapping on drums and bass is a blend. Club Ready Music asks the music model for instrumental edges, and then guarantees them by separating each take into stems and muting the vocal stem across those windows.

The mixing problem

A DJ transition overlaps the end of one track with the start of the next, often for 16 to 32 bars. Commercial club records are built for this with extended intros and outros that carry rhythm but no lead vocal. Music models, left to themselves, start singing early and keep singing to the end, because that is what most songs in their training do. A track like that can only be cut in, not mixed in.

What Club Ready Music asks the model

The lyric sheet sent to the model begins with an [Intro] block marked [Instrumental] with a note of the bar count and "drums and percussion only, no singing", and ends with an [Outro] block marked [Instrumental] with "no vocals, no ad-libs". The style prompt repeats the request in words: a drums-only intro of so many bars and an instrumental outro of so many bars. Any [Intro] or [Outro] you typed yourself is removed so there is exactly one of each.

Why asking is not enough

Models follow section tags most of the time, not all of the time. A stray ad-lib in the outro or a vocal that starts four bars early is common enough that a DJ cannot rely on the request alone. So Club Ready Music enforces it.

How the stem gate works

1. The finished take is split into four stems, vocals, drums, bass and other, with the Demucs model.
2. The vocal stem is silenced from the start until the intro ends, then faded in over half a bar. It is faded out over one bar into the outro and silenced to the end.
3. On a drums-only intro, the melodic "other" stem also fades in across the second half of the intro, so the opening is rhythm only. Bass stays, because DJs want it for the mix-in.
4. The four stems are summed back into one file with no level change, and that file goes on to mastering.

The windows are computed from your bar counts at your BPM, so a 16-bar intro at 128 BPM is exactly 30 seconds of vocal-free audio. The gate runs on vocal tracks only; instrumentals skip it.

What you control

In the DJ mix edit panel: intro bars (8, 16, 32), outro bars (16, 32, 64), a Drums-only intro switch and a No vocals in outro switch. Both switches are on by default. Turn one off and the gate leaves that edge alone.

Side effects to know about

If the model placed a lyric line inside the intro window, the gate removes that line from the audio. The cue computation notices this through the model's lyric timing and moves the intro end cue to where the vocal would have started. If the first verse matters more than the mix-in, shorten the intro to 8 bars.