Hi, Steve
Really appreciated your effort on computer audiophile.
I've just brought a white MacBook with SSD as a source to my DAC, Berkeley Audio Design Alpha DAC, using toslink cable.
Based on web search, does the Pace car sound better than the Off-ramp?
Yes, it has lower jitter.
Can you add USB input to the Pace car?
Yes, using the Tascam US-144 with slave-clock mod. This supports 24/96.
Will there be any difference in sound quality compared with toslink input (both can output 24/96 from Mac)?
No, jitter on the Pace-Car inputs is not important.
How long will you take to finish the driver for USB to output 24/192?
At the rate things are going, it will likely be end of 2009. It involves licensing new software, (a big expense), as well as me designing both a new USB module and a new dual-clock module to replace the Superclock.
It's important for me to outsource the assembly of the boards for my existing products to reduce lead-times, as well as adding the battery power supplies for Overdrive, Pace-Car and Off-Ramp. This will probably take all summer and fall.
Steve N.