Audio volume indicator:
On the left hand side of MRP40 Program window there is a vertical bar graph displaying the level of incoming audio by a (moving) green bar To get best decoding result the green bar should be between 5% and 90% of total range. Consequently please avoid overdriving your sound card's audio input! The green bar must NOT exceed 90%. Please read detailed instructions about audio volume and AGC settings. Click here!

Selecting the incomming CW Station:
Point with your mouse to that signal on the graphic "waterfall" display and click it. The two red lines will immediate "jump" to that location. Make sure the signal is right in the middle between the red lines. MRP40 only decodes signals that are between that two red lines. The built-in CW Filter is extremely selective, typical Bandwidth is 30Hz (dynamically adapted to speed) Nearby "neighbour" signals are totally suppressed and cannot disturb the decoder.

Weak signals:
Once you start to decode "on air" signals from your radio make sure to set MRP40 to weak signal decoding:
Click -Options -Rx-Settings -Weak Signal decoding
When testing the MRP40 program don't hesitate to select weak noisy morse signals. MRP40 works like a charm with such signals.

Locally generated Morse signals for training Morse skills:
Typically such signals contain only very few or no noise.
With other word it is a very strong signal (relative to the level of noise)
This requires a dedicated setting inside MRP40:
Click -Options -Rx-Settings -Strong Signal decoding only

The Built-in smart AFC:
The Automatic Frequency Control tunes the signal exactly into the center of the two red lines (center of ultra narrow CW filter)
The AFC automatically super fine tunes the MRP40 internal CW precisely to the signal and follows a drifting signal frequency automatically.
When the AFC Check- Box is in "OFF" state there is still a temporarily AFC action: Each time the recieve-frequency is changed by left-mouse click into upper window the AFC is activated for 4 secondes and fine tunes to the station.
This "Smart 4-Seconds-AFC" is generally not activated by right-mouse click into the upper window.