Drum staff will not play on my midi keyboard (Yamaha CP 300) and there is a delay at the start of playing the imported MXL file

Hello, I’ve been working with musescore now for a few weeks and was able to successfully import several XML files into it created by Encore. I am happy with the program and I’m trying to learn as much about it as I can. I have been using the Encore music notation program for 30 years and I’m trying to wean myself off of it because of the new 64-bit technology that is now becoming prevalent. I am having an issue with one of the XML files that I imported into Musescore. The drum track or (staff) will not play on my Yamaha midi keyboard. The other instruments such as piano and strings sound just fine. It is only the drum staff. I have read the handbook many times but I am unable to solve this issue. The midi channel for the drum staff is set at 10. At first on import, the default was a one line drum staff and I changed it to five lines. I added some other drum sounds but none of them will play on my keyboard. I also created a new drum staff and copy and pasted part of the drum notes on it but the same problem existed. No drum sound from the keyboard. I even tried creating a brand new score and a brand new drum staff in it and I still cannot hear the drum sounds from my midi keyboard. The drum staff does however play through my iMac computer using the built-in sounds. I appreciate that, but I really would like to hear the arrangement played from my keyboard. When working in Encore, I had to set the MSB and LSB to 0 127, but I could not find any reference to that here in Musescore.

I was experimenting with the closed HH which would be 42 F#1 on my Yamaha keyboard, but the musescore edit drum set panel shows me that they closed HH is number 42 F# 2. I was thinking that this might be the problem and that I could somehow edit the information to change the closed HH to F# 1 instead of F#2. I honestly think I could be way off base here lol!

The second issue I’m having is when I start to play that same score from the very beginning, there is a delay before the midi keyboard sounds start to play from the keyboard. The first 3/4 of the measure does not play but the at last beat of that first measure I can hear the midi sounds all rushing to kick in and play. It’s a latency problem of some kind but I do not know how to fix this. This only happens when I am connected in midi to my keyboard. Everything works fine internally in the program. I have sent you the file that I am having a problem with.

Thank you so much for any guidance you can provide.

Rich