Bernie,
Check out the specifications of the Musicpad Pro. Some have an operating range, and that 17.5-volt power supply may exceed that range. However, if it falls within the range, which is usually 12 to 20-VDC, then you should be safe.
Good Luck,
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)