A recent update to Chrome has caused the recording of audio to sound unclear. To fix, you need to disable the latest version of the Chrome Flash plugin. To do this, open up Chrome and type in the explore bar: chrome://plugins
This will bring up the plugins page and list all your plugins. In the top right hand corner is + Details, click this to expand the details. Now scroll down the page until you see 'Adobe Flash Player'. There will be a list of a few versions of flash player. The top one will have a Location that end in 'PepperFlash/PepperFlashPlayer.plugin'. Click 'Disable' beneath this, and this version will be disabled. The best version with the least bugs that we have found is Shockwave Flash 11.4 r402, so if you have any other versions as well as this one, disable them, and then click the 'Always Allowed' tick box at the bottom of the page section.
If this is too complicated, you could always try using Safari instead.