DigiTech HARDWIRE HT-6 Owner's Manual page 16

Polyphonic Tuning
The main benefit of the HT-6 Tuner is the ability to see and tune all six strings
simultaneously. To do this, follow these steps:
1. Press the Foot Switch to turn the tuner on. The output signal will be
muted while the tuner is on.
2. Strum all strings on your instrument. The LED Display Matrix
rows will begin lighting. Each LED row represents each string on the
instrument. The bottom row of LEDs represents the low E string (B
string on a 5/6 string bass) and the top row represents the high E string
(C string on a 6 string bass). If tuning a 4 string bass, the middle 4 rows
will light.
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