What, in everyone's opinion, is the best rack-mount tuner available? One that will tune bass frequencies, specifically a low B, fast and accurately? I recently moved my amp and a compressor into a rack and I have one space left. I have a small Korg tuner but it is very difficult to read under stage lights and the low B is difficult to tune with it, so I usually end up tuning it by ear the rest of the way. Any suggestions?