Iain McCurdy's Lofi UDO

Hi! I was trying to understand Iain McCurdy’s Lofi UDO example, but i couldn’t get my head around this line:

aout = (int((ain/0dbfs)*kvalues))/kvalues ; BIT DEPTH REDUCE AUDIO SIGNAL

For the context, here’s the link to the csd:
Lofi.csd

Thanks in advance,
PeeVeP