Tell me some tips and tricks about using the Kurzweil sp3x stage piano

I moved you from computers to Piano , where you belong

we no 152 page so.. best fit.\\

why not go to the makers web site and RTM read the manual
google them.
1st hit lands me.
http://kurzweil.com/product/mark_152i/

is my google better than yours, if yes why?

If you';re sure it's the instrument, rather than your amp cutting out or the cord being intermittent, do a factory reset. Beyond doing a reset, it's doubtfull this will be a user servicable problem. You need to contact Kurzweil Support. Here is a link to their page
Support Kurzweil

The Kurzweil SP3X is a popular stage piano known for its high-quality sound, responsive keyboard, and versatile features. Some of the advantages of the SP3X include its excellent sound quality, which is achieved through Kurzweil's advanced sound engine and a variety of realistic instrument sounds. It also has a highly responsive keyboard that is suitable for playing a wide range of musical styles. Additionally, the SP3X has a variety of features that make it a versatile and useful instrument for live performances, such as its built-in sequencer, arpeggiator, and various effects. Overall, the Kurzweil SP3X is a reliable and powerful stage piano that is well-suited for both professional and amateur musicians.

Is this the correct sustain pedal for this unit? It sounds like it should be a momentary button type. I would look into that. Some have a push to work type of switch and some use momentary. If it is, I would open that pedal and clean the switch with contact cleaner, as it appears to be sticking.

Verify the sound in headphones directly from the unit. The cymbal MAY be panned to one side or the other and will require higher frequency response than some of the piano notes.

It could be your internal battery. Do a search on keyboardforums.com for additional support or Kurzwil website. good luck!

That happened to mine. All I did was hard reset it.

It sounds like the new board and firmware has gone to abbreviations instead of fully spelling it out.

I would complain to the store since they should warrant it if it is a problem... but be prepared to accept that the firmware has been changed and displays differently now.

Probably a cable has come loose inside the unit. The keys are scanned by the internal processor as a matrix of two contacts per key. Often the keyboard is divided into two sections.
You will need to have it repaired or if you are electronically adept, open the case and look for obvious problem.