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"Great teacher (Sandy) with lots of patient. Friendly and nice and also passionate till I have little time to rest my poor little hand. Learned for about a year plus and now can play more fluently and confidently. Price is acceptable and duration is just nice."
Attempted to clean? Not a good idea obviously...Take it apart like you did before and look at the wiring and imagine that you can divine the thing to reveal some logical explanation. If you used a contact cleaner or spray to clean, that could be death to that piano my friend.
It sounds like there may be an issue with the piano sounds on your Kurzweil sp4-7 keyboard. One possibility is that there may be a problem with the software or firmware of the keyboard, in which case you may need to update the software or contact the manufacturer for assistance. Another possibility is that there may be a problem with the internal hardware of the keyboard, in which case you may need to have it repaired by a professional technician. In either case.
I had an issue with my Suzuki GP-3 and I did a research and found a company called VMI Electronics (619)244-0006 they found me a technician in my area also there is a repair kit called Key Mod that fixes issues with the keys hanging low, here is the link to order it on ebay: http://www.ebay.com/itm/Key-Mod-Piano-Rod-Replacement-Kit-/190822310728?pt=LH_DefaultDomain_0&hash=item2c6de56348
Pianos do NOT respond to keys pressed hard... they respond to FAST presses. If you have an issue with the piano, first go on record to activate your warranty. Most of these electronics DO have a setting that adjusts the "feel" which affects the loudness versus key velocity... Now here is a secret??? Shh... The manufacturers turn up the demos just like the advertisers turn up the commercials on the TV... I would suggest looking for the adjustment of feel, and if that doesn't get satisfactory results, find another and compare yours to another... if yours is still underperforming, exercise your warranty for repair or replacement.
Although the keys have a weighted feel, this is not because of a system involving connection t hammers as in an acoustic piano. This is done mechanically, however, which would indicate a need for cleaning. If you have an authorized Yamaha service center in you area they would need to do the cleaning.
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