too bad...
gonads is right, metering is very important, especially in 16 bits, and an analog meter is not enough, cause it's a digital device, so it should come with digital peak metering, so the external meter is not such a good idea (even if it's better than nothing): Ideally your peak should be around -8 /10dBFS, so you have 8 dB before digital clipping, and you still keep around 90 dB of dynamic (without the analog noise).
Is there at least a clip signal?