Think about it. The 12 hours o' the clock can be 'bonged' with only 4 strikes. 1 is 0001, 2 is 0010, 3 is 0011, etc. up to 11 which is 1011 and 12 which is 1100. The 0 could be bonged by an low note (low frequency) and the 1 could be bonged by a higher note (higher frequency). In case the user is 'tone deaf', there is at least one 0 and one 1 in each of the hours 1 - 12, so at least the user should be able to discern that 'low, high, low, high' would be 0101 which is 5 o' clock.

So how about it, you electronic geniuses. How could one build a clock like that??!! Huh?