Hi Karl,
you have to insert multiple additional Tempo events on the right time positions to reduce the Tempo in well defined steps:
- First you should find out and write down the positions (measures) where the Tempo should be reduced in your song.
- In MIDI Multi Recording go to Step Edit and select "SysEx" instead of "Ch1" there.
- At the beginning of the song (normally on position "001 : 1 : 0000" you should see a "Tempo" event.
- Select this event, then use Copy & Paste to copy the Tempo event multiple times.
- Adjust the time position (measure : beat : clock) of those additional Tempo events as desired.
- Adjust the value of the additional Tempo events as desired.
- Save the song. (It is best to use a new/changed filename to keep the original file.)
P.S
You could also use a PC MIDI editor program like "MixMaster" or a DAW like Cubase. There you can make such changes to MIDI files much faster and easier.
Hope this help!
Best regards,
Chris