Quote:

"BASS BOOST
F0H 26H 7BH 7DH 00H Boost_gain Freq F7H"



That looks like a System Exclusive message; written in hexadecimal format (starts with F0H ends with F7H)

This may be a valid message. RealBand addresses these as 'Sysex' (System Exclusive).
The name means what it implies; it is an exclusive message to a described device. It'll work, but only for that device. You won't find this message in piano roll (as far as I know).
System Exclusive messages are best handled in the Event List, (not Piano Roll in my experience) where they can be seen/edited.

MIDI can be quite involved, although it is a simple concept really.

Controllers are pre-defined, sysex is meant for one certain device (be it lights, synth, sampler, guitar effect, vocal effect ..) and can often do something 'special' on that device that is not a standard MIDI controller message.

Research MIDI System Exclusive
Maybe even try it.

MIDI is just information sent on a certain channel. If the device is set to respond to that channel it does what it is told, whether it's just to change sound and play these notes, or to do that and push the whammy bar up, and press harder on the keyboard and change the lights .. it's all just information on a set channel.
Some of it is pre-defined (like the GM soundset) but a lot of it is determined by the receiving device. Otherwise it's just numbers being sent over a set channel ..

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