I was just running Renoise in Directsound mode while listening to some tracks and I thought that I would try to match some bpms.
However this wasn’t very easy so I realized that if you have a slightly slower BPM and press F9, F10, F11, F12 on the beat then your sequence will match the beat.
But the problem is advancing to the next track with F9.
So, I made this script, which simply makes F9 send F9 and Ctrl Down.
So you’ll see F9 will advance to the next pattern’s start. You can simply use Home to reach the beginning of the current pattern.
Another thing I thought to do was make Ctrl Up send Ctrl Up and F9. So when you go back in a pattern you go to the start of that pattern.
Hopefully I might be able to use this idea and record my loopback system audio thru the Wave or Stereo Mix devices to perform and rerecord previously finished material with some global rhythmic variation.
If you install AutoHotkey you can put this in a .ahk file and run the script. Windows users only 
#maxhotkeysperinterval 30000
#UseHook On
^Up::
SendInput ^{Up}
SendInput {F9}
Return
#UseHook Off
F9::
SendInput ^{Down}
SendInput {F9}
return