First Look: Source Audio True Spring John BohlingerJanuary 30, 2019VideoJohn Bohlinger tests this stereo pedal that pairs authentic-sounding amp- and outboard-reverb simulations with optical-, bias-, and harmonic-tremolo sounds.featured-storieswhats-newvideostremolofirst-lookeffectsspecial-featured-storiessource-audioreverbgearGearEffectsFirst LooksVideosReviews