Tascam US-428 Owner's Manual page 64

Four Controller Banks (Encoders)
This protocol is nearly identical to the
"Four Controller Banks (Pots)" protocol.
The only difference is the treatment of
the rotary encoders (GAIN, FREQ, Q,
PAN and DATA Wheel).
Instead of emulating potentiometers, a
turn one click to the right would send a
MIDI value of 68 (or 65 if SET is held
down). A turn one click to the left would
send a MIDI value of 60 (or 63 is SET is
held down). The result makes changing
banks "seamless" to the user.
Initialization
When one of these protocols is first
selected, SEL 1, LO and ASN are
selected
in all four banks, and BANK1
(AUX1) is selected. In "Four Controller
Banks (Pots)" mode, all rotary controls in all
four banks are set to the physical fader
positions. The channel faders in the other
three banks are set to 0 value.
Illustration 8.02 – US-428 Four Controller Layers
64