Is it a serious limitation of the Tascam 424 MkIII that if you use Channel 1-6 as an Effect Return you can't adjust the level of the incoming signal to any useable amount, but if you use Channel 7 or 8 you can't EQ the incoming signal? (That is, if you keep the Mix (and Output?) knobs of your outboard effects unit on Max. as recommended in the 424 manual). Is the workaround to adjust Mix and Output on the outboard effects unit? Just wondering what other people do.