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A bad power supply could make this sort of thing happen. There could be other causes, but the PSU would be the first thing to have a look at.

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There doesn't seem to be an Angel Voices in any M1 Programs or Combis. The nearest I can find are:
Angels in the original Factory Programs

In addition there are these, listed in a document ent ...

There is some interesting discussion, dating back from the relatively early Kronos years, with links to a resource for folk contemplating writing their own software:

http://www.korgforums.com/foru ...

There is no way of converting the assigned Timbres in a Sequencer (.SNG) file, together with all the relevant effects and routings, into a playable Combi.

As far as I'm aware, nobody has created ...

Is the Global MIDI channel set to channel 1?

Troubleshooting beyond this point is going to require a range of test equipment and a good knowledge of electronics. Going to a keyboard tech may be t ...

Have you tried initialising the X5D?

Hold Page + and Page - while turning it on.

Then perform a preload - Global Screen 5A, then select "OK".

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Load the Song in question, and select the MIDI channel to be edited. Note the start and finish locations (Measures and Beat Ticks) in the Song where the changes need to be made.

Go to Menu page P ...

Have you tried going into Global mode, pressing EXIT twice, then holding down ENTER and pressing 3 on the numeric keypad. This will put the M50 into Touch Panel Calibration mode.

If the above do ...

That sounds like expected sostenuto pedal behaviour, i.e. only those notes whose keys were depressed when the sostenuto pedal was depressed, will continue to sound.

It seems that what you're real ...

If it's of any help, there is a one oscillator HD-1 Program called "In My Life Harpsichord" on the Kronos 2, that was also available as a component (KRS07) of the "New Kronos Sound Pack ...

It's good to know that Korg are continuing to support users of this venerable instrument.

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That Fisa Suprema accordion has some serious untapped potential going for it. Imagine a musician on stage starting to play the thing, and a screaming lead guitar sound comes out of the speakers!! It ...

It's necessary to log into your KORG ID account. If you don't have one, then it will be necessary to create one.

Once the KORG ID account has been created and logged into, it may be possible to ...

It will probably depend on the nature of the fault.

There will undoubtedly be a small market for an enterprising electronics person, who understands switched mode power supplies and their repair, ...

Get the power supply checked. It could be on the way out.

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