Hey Furry, you have probably figured out what you are doing for pre-amps by now but I am new to the forums here, and noticed no one had responded to your question. I too found that on my DP 02, the mic pre-amps were somewhat weak. Thankfully I own a Presonus TubePre V2. While not a true tube pre-amp, this pre does have a tube circuit in it that will help "warm up" your mics or DI guitar. The pre I have is a 1 channel version, but they also make a 2 channel version. The 1 channel version sells for $129 on most gear sites and periodically goes on sale. It is a decent pre-amp at a good price.