HI, All the while, I recorded my vocal & instruments like guitar directly from the Mics (condenser & dynamic) to the Audio Interface. And, recently, grabbed a preamp + compressor for recording. Sound is good! In fact, facing an issue ~ Low Input Signal BUT High Hiss Noise Level!!! This makes me spent a big times to tweak the Denoiser + Expander + Noise Gate to reduced the Hiss Noise. Indeed, quality/colour of the recorded audio like guitar, cello... not as sweet & pretty like the source anymore after the tweaked! My setting was : Mic to Preamp to Compressor to Interface (am I wrong?) Mic directly recorded from the audio interface (previously) given High Input Signal and Hiss Noise was acceptable. But now, thru the preamp + compressor (I though it supposed producing Higher Input Signal) Input Signal was low. When turns up the Gain Level from the interface, Hiss Noise is turning up too. Hope to hear from your precious suggestion and advices! Your replies are appreciated! Thanks in advanced!