How can I transfer a 06PK61.bup file to a Yamaha YPT400 keyboard?

Normally this would be from dirty or broken key contacts.

The BUP file is proprietary format for each model Yamaha keyboard. Your best solution is to export via MIDI interface and use that format.

Transfer the data in MIDI format. The BUP format is a proprietary format to the keyboard and can ONLY be played by the keyboard. Either dump the data as MIDI format or using a MIDI interface send it to the PC or lastly, capture the audio using an audio interface on the PC.

You will need the CDROM that should have come with the keyboard when you purchased it. On it will be the drivers that need to be on the computer for it to use the usb. The link to the manual is here:http://www2.yamaha.co.jp/manual/pdf/emi/english/port/psri425_en_om_a0.pdf Please look at page 86. If you don't have the CDROM you may be able to download what you need by contacting Yamaha by email through this link and asking:http://www.global.yamaha.com/support/contact.php I hope this helps.

Yes. You will need to have a MIDI interface on your OC and also select in the sounds control panel of windows that you are using the external synth. The MIDI will expect the PSR to respond to the "general MIDI" assignments.

The BUP is an archiving format proprietary to the Yamaha apparently containg styles as well as note data and conversion is really not easy.

If you can get the instrument itself to spill out MIDI and use a MIDI interface and software to capture it on the PC is the best plan.

Once it is in SMF format you can play it on the PC.

how can i play .bup file in computer?

ok here is the solution!!!!!!!!

• we should have a mic pin and audio cable as shown in this pic
• 
connect these cables,and connect big pin to the piano and small pin to the computer (mic or input jack)

now take windows movie maker (start-all programs-windows movie maker). click on narrate timeline (as a mic icon below windows movie maker).

now click start narration on the pc and play your song on the piano. you can see input level highlights. now your song is recording. when your song completes click stop narration and save to the pc. walah if you can't understand this say to me. i can add video. sry for my worst english

This looks more like a computer problem than a musical instrument problem.

Sounds like you have a great system,heres a link you can call customer support for a relacement key or a service locationkeyhttp://www.yamaha.com/yamahavgn/CDA/ContentDetail/ModelSeriesDetail.html?CNTID=451442&CTID=205100