What does Boom's PAD switch do?

The Boom's PAD switch is special. Not only does it reduce the input gain, but it also greatly reduces the input impedance.

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Normally, the Boom's Instrument Input impedance is 1MOhm, suitable for the Hi-Z passive pickups on guitars and basses.

When PAD is engaged, the Instrument Input impedance is reduced to 3.2kOhm, suitable for modern keyboards and the Low-Z Active Pickups found in guitars and basses.

If you plug a passive instrument pickup into the Instrument Input and engage the PAD, the sound of the instrument will be radically changed given this alteration in impedance.