Echolink Audio Setup, DTMF

Under Tools/Setup/Audio, the Calibrate button suggested a fine tuning of -94, but with that the DTMF tones were not recognized...

What works:

• Fine tuning: 0 (default)
• Sound card "Microphone" level 50% with "Advanced", "Boost" enabled
• Sound card "Volume" all 100%, master volume around 75..80%