"Second Rush" is a remix of "Oh Wow What A Rush", which appeared on the first Hedgehog Affair EP, originally released on Sound Entity SE4.
Track A2 samples:
Vocal from Catch-22 - Boogie Down (Do It)
Track B1 samples:
Dialogue from an episode of Quantum Leap entitled Good Morning, Peoria
Track B2 samples:
Synth from Vienna - Tell Me (Innerspace Mix)