Harry,
You are correct. I checked a sequencer song that had the problem of the volume pedal and found the volume command. I removed the volume command and the problem was solved for that particular song. I will follow this procedure for my favourite songs.
The remaining problem now is that the problem occurs everytime I switch on the keyboard. For normal operation the main volume is set for maximum output and output is controlled by the pedal. If the pedal is not touched after switch on the volume is at maximum, independant of the position of the pedal. This means that I must not forget to touch the pedal before I touch a key. I assume this is not normal and I would like to solve this. Any ideas?
Bert