The MIDI standard leaves a lot of controller numbers "undefined".

Presently the following MIDI controllers are undefined: CC# 3, CC# 9, CC# 14, CC# 15, CC# 20 through CC# 31, CC# 35, CC# 41, CC# 46, CC# 47, CC# 52 through CC# 63, CC# 85 through CC# 90 and CC# 102 through CC# 119. That means of the 128 controller numbers 56, or almost 44 percent, are undefined.

PG Music has a good overview of MIDI and MIDI controllers available +++ HERE +++ .
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Jim Fogle - 2020 BiaB (713) RB (Build 3) Ultra+ PAK
Cakewalk - Zoom MRS-8 recorder
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