The FX-A1 with backlighted 10-segment LED bar graph, the FX-D1 with 4-digit backlighted LCD and 12-bit CPU, and the FX-M1 with 12-turn potentiometer adjustment use a pushbutton/rocker switch design. The FX-A1 and FX-D1 offer the latest in high accuracy setting and flexibility for programmable amplifiers as well as fine tuning adjustment. The FX-M1 offers a 12-turn clutched potentiometer for accurate sensitivity adjustment.
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