Please adjust your Rx audio level this way:

- On your radio set the Rx audio band-with to 2.4kHz (USB or LSB)

- Go for example to 40 meter band and find a frequency where is not any signal and "feed" MRP40 with pure noise while not any CW or SSB signal and no atmospheric spikes are pesent.

- Adjust the volume of audio from your radio to a level so that MRP40's green volume bar will display just half of one single scale-tick-mark see image:

- Now tune in to an active CW-Station.

- Adjust the position of the horizontal slider so that the selected CW Station prints out as white colored dots and dashes.

- If the color tends to be more red then reduce the horizontal slider till it gets white

- If the color tends to be more blue then increase the horizontal slider till it gets white

See image:

Horizontal Slider
The best position of the horizontal slider is found when the selected incomming CW Station is printed as white dots and dashes.

If the horizontal slider psition is middle then it can compensate volume for -20dB to the left side and +20dB to the right side

Very strong incoming signals might require to be compensated with the -20dB position on the left

Very weak incoming signals might require to be compensated with the +20dB position on the right

MRP40 is very forgiving regarding the position of the horizontal slider.

It still works quite good when signal color turns to blue or red.

But the very top of decoding performance is reached when signal is printed as white dots and dashes.

Automatic Gain Control on your Transceiver (AGC)
MRP40 has an own build in AGC that is highly effective compensateing all kinds of amplitude variations of incoming signal. In some situations it can be of dis-advantage if the AGC of the Trensceiver is active! Here you have to distinguish between two cases:

1) If you operate your Transceiver in SSB-Mode with an audio band width of for example 2500Hz, then make sure to switch the AGC of Transceiver OFF otherwise strong "neighbour" CW signals force the AGC to serverely intermodulate the amplitude of the station you are recently trying to decode with MRP40.

2) If you operate your Transceiver in CW-Mode with a small audio band width, for example 400Hz, where only one CW signal is comming in, then you can let the Transceiver AGC switched ON