When I first bought this instrument, it was great and worked out okay. However, after using it and working to use it in performances, I have had many issues with the batteries and code 88. This basically means that your batteries are dead, and it is not very easy to get them replaced.
Thomann were very helpful with the whole process, but it took them almost 2 months to get new batteries out to me, and now the new battery has the same problem as before. Basically the unit is junk without a battery and cannot be used at all. It is not very reliable and I wonder how many others are having these issues with batteries?
If I had to do it over again, I would not have purchased it, but maybe it is just my unit?