Markbass R 500 - Manual (Page 8)

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TUNER OUT
The TUNER OUT (18) is an unbalanced signal that can be sent to a tuner, allowing you to tune as you play without passing your signal through pedals, which can degrade the
quality of your signal. You can also use this output to send your signal on to another amp, or any kind of recording unit that doesn’t require a balanced signal.
EFFECT SEND AND RETURN
If you use effect pedals or rack gear, you can route them through the SEND EFFECT (20) and RETURN EFFECT (19) jacks on the rear panel of the amp. The effects loop is
wired in parallel this means that if something happens to your effects chain (a battery dies or a cable gives out, for example) while you’re playing, you will not lose your main
signal. If desired, however, the effects loop can be easily modified by authorized service personnel to operate in series.
FOOTSWITCH
The R500’s optional footswitch has one on/off switch. This is a mute control that interrupts the output signal from your amp, but allows it through to a tuner, should you have
one plugged into the rear panel. This is handy if you need to tune discreetly during live performance. The blue LED (4) on the front panel illuminates when this switch is activated.