Scraped out awful techno part (4)
I believe the answer is:
alto
'part' is the definition.
(the alto part in a piece of music)
'scraped out awful techno' is the wordplay.
'scraped out' suggests removing the centre (inside letters scraped out of the word).
'techno' becomes 'to' (I can't justify this - if you can you should believe this answer much more).
'awful' with its centre removed is 'al'.
'al'+'to'='ALTO'
(Other definitions for alto that I've seen before include "One who sings" , "Unisex vocal range" , "Counter-tenor or contralto" , "Low female singing voice" , "someone to sing" .)