If i wanted too make a beat, that was for example 3 minutes long but i wanted the first 2 minutes 90 bpm and the last 1 minute 150 bpm, is it possible to do that on music maker?
@Ikonik This does not work in Music Maker but you can export all your tracks as up to 8 WAV files and load them up in the free Samplitude Pro X4 Silver http://dl04.magix.net/2019/SamplitudeProX4Silver/Program/SamProX4_Silver_INT_200121_07-59.exe
It can load up to 8 tracks, that is the limit for the free version. Just drag your tracks in and set some tempo markers (menu Edit > Tempo > Insert Tempo change) and activate the "Interpolate tempo to preceding marker" checkbox for a gradual change, in case you want a gradual change.
Click on your audio object and in the object editor go to Time/Pitch and activate the "Use musical tempo adjustment" checkmark. The audio file then stretches depending on your tempo markers.