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How to get good sound from my amp???

Take all of the tone knobs on your Yamaha bass and put them flat. If they are tone knobs, all the way up so you have a bright tone. Turn up all the volume knobs. Put the pickup balancer knob in the middle.

Put your First Act amp's knobs at 12 o' Clock. Play your bass and adjust one knob at a time. Turn it half way to the left, then all the way to the left. Then halfway to the right and so on. Play slowly and you will start to hear what each knob really does. It's a practice amp - stick to boosting the high end (treble) to get that slap bass tone.

Presence is the really high frequencies and will amplify the string noise the sound of you moving your hands over the strings.

Let us know if you have questions.
 
boost @ 200-250 hz
cut @ 400-450 hz
boost @ 1k-1.5k hz

IOW, raise your lo-mids and hi-mids at their extremes and cut the mid-mids if you can do that.

try that for a deep, punchy, slap tone.

It's a 4 knob amp with only 15 watts of power. There are no extra tone choices on this head, maybe on the bass, but the amp will not get loud enough for anything but practicing 8 feet away from it in a bedroom.