M-LIVE Merish Plus Reference Manual - page 17
example
Current Song: Blueberry Hill
Next Song: Beast of Burden
optional
16
Operating functions
GO TO: Next Song with mixing in sync and with key change
Changing bpm and key of the Next Song
Manual changes
It is possible to change the tempo and key of the
Next Song manually, even before playing it, selecting
it with the Next/Current SONG button and using the
SPEED and KEY keys.
Automatic changes
When Crossfade mode is enabled, instead of Immediate mode
(or when a Playlist is enabled), if the current song and next song
have a difference in tempo that is less than that set with MENU /
Fade Curve /
AutoBPM range, Merish automatically adapts the
Next Song’s Bpm to match that of the Current
Song, then gradually increases or decreases it
during the performance of the Next Song, until its
original value is reached.
If the difference in tempo is greater, Merish leaves
the original tempo of the Next Song unchanged,
to avoid spoiling its musical sense.
In practical terms: in the event of small differences
in tempo, Merish adapts the starting Bpm of the Next Song, in the
event of large differences, Merish leaves things as they are.
In the example:
The original key of the Next Song (E) was manually
lowered by two semitones to keep the same key as
the Current Song (D).
The tempo of the Next Song was automatically
adapted by Merish: the Next Song begins at 95 Bpm
(6 beats per minute slower than its original tempo)
to adapt to the Bpm of the (ex) Current Song and
gradually increases until it reaches the original value
of 101 Bpm at bar position 19.2.