Changing sample rates to halve speed

Hi
I'm digitizing dozens of 1960's R-2-R spoken vox tapes recorded originally at 1 7/8 and 15/16th ips. In Audacity I can do this with a high computer sample rate/ high tape speed and easily play back at a lower sample rate in order to speed up the whole process. I would like to do this in Sonar X3 as I am more familiar with Sonar. Is there an easy way to change playback sample rate "on the fly" as in Audacity? I cant seem to find one.
Cheers, David

P.S. Quality is no issue here so tape EQ does not come into it.

Thanks for suggesting that Scook.
I've tried it and it works great on short-ish clips but not, unfortunately, on longer ones. Some of my files are over an hour. It throws up an error message once things get too demanding. I guess Audacity it is.
Cheers
David