Sometimes I find it handy to visualise nibble data as a waveform rather than a set of hex numbers / binary data. I've made a simple tool for viewing data nibbles in this way. The main parameters are file offset in bytes (not nibbles) and whether the nibbles should be viewed as "high nibble followed by low nibble" or whether the nibbles should be viewed "low nibble followed by high nibble".
Download here: http://milkcrate.com.au/_other/downloads/max_patches/nibble_viewer.maxpat.zip
This patch will work with Max and with the free Max Runtime.