I tried the new beta version of CD Spin Doctor v184.108.40.2063t sent to me but with less success than before. I have two hard drives in my computer, one running Tiger and the other Leopard. Under Leopard after installing and restarting, it was possible to select CD Spin Doctor Capture Support as the sound output, but there was no similar option to choose it for the sound input. In the previous version of Spin Doctor v220.127.116.117t, it was possible to choose CD Spin Doctor Capture Support for both the sound input and output. With the new beta version sent to me, since it was not possible to choose CD Spin Doctor Capture Support as the sound input, there was no sound heard to record.
When I tried the beta version running under Tiger, there was no option to choose CD Spin Doctor Capture Support for sound input or sound output. The Extension file CDSDAudioCaptureSupport.kext was created in both systems after installing Audio Capture Support although the one created in Tiger was only 260 KB in size whereas the one in Leopard was 1.3 MB in size