My homeWorx, is single tuner, no built in drive, USB port, hdmi, and RCA outputs
What ever the network is broadcasting is recorded
Say ABC at 1080i
Then the recording is 1080 resolution
It copies the broadcast transport stream,
It has live tv pause etc..
Put i suspect the channel master, responds faster too some commands, such as live tv pause
Which works by turning on the record function and stopping output play
Filling a buffer file, This is the way they all do it, the only way they can do it