I am trying to use this to record vinyl from my record deck to my Apple MacBook Air.
It’s a MacBook Air 6,2 with an Intel Core i5 1.3GHz processor with Yosemite 10.10 and I’m using Audacity 2.0.6.
The turntable is a Thorens TD 166MK VI.
The turntable is connected to the computer via the Climax Digital USB2.0 Audio Capture ACAP100
System Preferences>Sound>Input is USB PnP Audio Device
Audacity>Preferences>Devices - Interface is Host CoreAudio using PortAudio V19-devel, Playback is Built-In Output and Recording is Device USB PnP Audio Device with 2 (Stereo) channels
I can hear the music through the computer speakers at very low volume but the Audio Track trace at 48000Hz 32-bit float is a flat line with no reaction to the audio input.
Can you suggest what I am doing wrong? 
Audacity does not officially support Yosemite, nor does your device according to http://www.climaxdigital.co.uk/USB-20-Audio-Capture-transfer-analogue-audio-sources-to-digital-format.
Are you connecting from the RCA outputs of the turntable? There is nothing to say apart from a little diagram in their PDF that you can directly connect a turntable (that is, nothing to confirm that sufficient amplification or RIAA Equalization is applied). See this Amazon customer review of ClimaxDigital ACAP100 USB 2.0 Audio Capture.
Do you have a phono amplifier you can connect to the turntable then connect the USB gizmo to the amplifier?
Gale
Many thanks for your help. I intend to see if I can do it through my HiFi Amplifier instead.
This set of tutorials in the manual may be of use to you: http://manual.audacityteam.org/o/man/tutorial_copying_tapes_lps_or_minidiscs_to_cd.html
WC