As of now, when having Aghanim's Scepter, Viscous Nasal Goo's sound can get very choppy, because it is limited to play only a maximum of 2 times. So whenever a new enemy gets hit, the sound on a previous enemy gets instantly stopped.

This causes an ugly choppy sound.

A possible solution to this would be

1. Remove the sound limit, let it play for each hit enemy normally
2. Make the current impact sound a hero-only sound effect, playing only on hit heroes
3. Add a new creep sound to Viscous Nasal Goo, that is shorter and quiter, and plays on hit creeps only.

This would be same approach as on Brewmaster's Cinder Brew, which was given a shorter sound for hit creeps.