Forum to discuss all matters relating to the MPC1000 and MPC2500 operating systems created by 'JJ' (all versions).
By karma Sat Jan 17, 2026 8:01 pm
Whenever I power on my mpc1000 running os2xl, the f5 and f6 buttons are unresponsive until I press some other button. Anyone else experiencing the same? Not a big deal by any means, just kind of annoying. I'll submit a big fix request if others notice the same behavior.
By Moot Sun Jan 18, 2026 9:44 am
I had the same a few years back yep. Just old tact switches gone bad, often happens with the buttons we use a lot unfortunately.

Good news it's an easy cheap fix, if you or anyone in your orbit are handy with a soldering iron - just don't do what I did, trying to do it myself with the only shitty tools I can get where I live, burn the PCB board & wreck it, having to replace the whole board from MPCstuff That's not a bad option, just for the F1-6 board it's relatively cheap, but shipping to where I am in Asia doubled the price.
By karma Mon Jan 19, 2026 5:00 am
Moot wrote:I had the same a few years back yep. Just old tact switches gone bad, often happens with the buttons we use a lot unfortunately.

Good news it's an easy cheap fix, if you or anyone in your orbit are handy with a soldering iron - just don't do what I did, trying to do it myself with the only shitty tools I can get where I live, burn the PCB board & wreck it, having to replace the whole board from MPCstuff That's not a bad option, just for the F1-6 board it's relatively cheap, but shipping to where I am in Asia doubled the price.


hey i appreciate the reply, but it's definitely not the tact switches. if i first press either the f1, erase, main, left cursor, right cursor, down cursor, rec, or over dub buttons then the buttons that were unresponsive (f5 and f6) become perfectly responsive again. it's just when i power on the mpc without pressing one of those other buttons first, then f5 and f6 are completely unresponsive. it is either a buggy os or my mpc is buggy. but this only started happening when i upgraded to the latest os2xl (3.86) so i feel like it must be a bug in the os.
By karma Mon Jan 19, 2026 7:37 am
sent a message to jj and his reply made it make sense. the solo and mute buttons are disabled while sequence = (unused). not a bug, but rather a specification.
By Moot Mon Jan 19, 2026 9:31 am
Oh! I can see how that might confuse things alright..

I'm still on the same version of JJOS2XL that came with mine when I got it around 2013, never found any reason to upgrade myself! ;)
By elmacaco Tue Apr 21, 2026 11:29 pm
Definitely check the latest 2XL OS, one of the best machine OS integrations everC and most if the research for features happened on these forums.