There are no such thing as MIDI tempo messages.
In MIDI, the tempo is derived from Clock messages sent at fixed intervals.
Since the MiniLab doesn’t have any MIDI Clock generator, there is no way it can send such messages.
On the other hand, any DAW should be able to send these messages to your Synth and some might allow automating this parameter from any Control Change message issued by the MiniLab.
There’s even a software dedicated to that :
http://midiclock.com