wavelength, Mic the cello between the bow and bridge, about 8-12" away (best thing is to ask the cellist to play, and put your ear in that position and move in or out to find best position for mic). I'd use either the c2000, 3000, or rode if you want the definition of the bow. The 414 will give you a warmer sound. Depending on the sound of the instrument and what you get to tape, or disk, you might use the low frequency rolloff as well (last resort) if the sound is too boomy. too bad you don't have a big, live room to track cello in, strings love a live room. You could track the guitar at the same time, players facing each other, since you have several cardiods. Leakage isn't always bad, but surely makes it tougher when/if you need to do punches. Is keyboard digital? Go direct there and track drums at the same time, especially if pianist is doing a bass line on left hand. Track vocals seperately. Good luck!