A long sustained growling synth bass effect.
Deep low and hollow loud industrial crashing sustained sound effect.
A sustained F2 from an upright bass.
DX7 electric piano chord sustained in A.
A DX7 electric piano chord sustained in C.
A long booming extreme resonating bass note in the key of B.
An eight bit retro synth sound with a pitch of C2 sustained.
A long sustained bass D chord.
A sustained chord of Bb minor, on heavily distorted electric guitar.
A sustained chord of E minor, on heavily distorted electric guitar.