Sample Modern has released Detuned Upright, a free upright piano instrument library for Native Instruments Kontakt by Mkhitaryan Production and Sample Modern.
This is an instrument with a pretty damn rough sound, and is not usable for serious, and classical music. Anyway the specific detuned and “Low Quality” sound is very tipical and demanded for ambient, background and saloon music.
We did not find anything better than mobile phone microphone to record the samples. Of course you can make some ear-pleasing music with this instrument.
Detuned Upright is a free download for Kontakt 5 (full version).