
1) Balungan instrument 2) Keyboard percussion
Found on
https://www.crosswordclues.com/clue/slentho

The slentho (also spelled slento) is a musical instrument of the gamelan. It is similar to the saron family of instruments, and would be its lowest member (pitched one octave below the saron demung). Like those instruments, it has (typically) seven keys in the same arrangement, over a resonator box, and is hit with a wooden mallet (tabuh). However...
Found on
http://en.wikipedia.org/wiki/Slentho
No exact match found.