I am always struggling with the MK2R and the wave files for the Icom 7800.
This time I decided to see what causes the real problem and make it working so that it works again next week. After reading the manual I found out that there was the possibility to change a few jumpers in the MK2R to get a preamp working. I decided to give it a try. The manual says older Icom radios needed the preamp (I thought an 7800 is not so old). It worked out well. The wave files are playing like never before.
Today also put the latest firmware in my oldest Alpha 9500.