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Look for the AMC Adjustment point (modulation potentiometer) or modulation adjustment pot. Use a reference for your brand and model of radio to identify the correct potentiometer.Look for the AMC Adjustment point (modulation potentiometer) or modulation adjustment pot. Use a reference for your brand and model of radio to identify the correct potentiometer. It should have a label on the board itself. The label will be something like "VR5" but not necessarily that. Again, you need a reliable reference for your model, or a schematic diagram so that you can identify the correct potentiometer. You will typically turn the adjustment counter-clockwise to increase the modulation. You can start by turning the adjustment counter-clockwise until it stops to achieve full modulation. You will typically turn the adjustment to increase the modulation. You can start by turning the adjustment counter-clockwise until it stops to achieve full modulation. Turn clockwise or counter-clockwise? It depends on the radio. The way it has the furthest to turn is probably the wrong way. The logic follows that there should be less room to turn it up as opposed to down as modulation is typically factory set above 50% of the potentiometer adjustment value. Make note of the position prior to making an adjustment. It will not turn more than 360 degrees (it is not multi-turn) and you will likely not have far to turn it before achieving maximum modulation.