If there's a reason for you to trim &/or convert audio files on-line rather than in your PC/laptop, SoundFrost may be OK -- otherwise you could most likely do better on your own *if* you wanted to bother... when you're working with media just about everything I can think of means some sort of compromise between how easy it is, how long it takes, & the level of quality. While I don't like ffmpeg as much when you're working with audio, if you just wanted an alternative to SoundFrost you could use on your own, I think the TAudioConverter might do the trick, & there is a portable version http://www.videohelp.com/tools/TAudioConverter -- I'll more often use LameXP for conversions but I don't think it's quite as versatile http://www.videohelp.com/tools/LameXP
That said, there's a couple few things I wanted to mention... The trial of SoundFrost is newer than the GOTD, but adds MyPrintScreen.exe -- I could have missed it but didn't *see* any choices during install. The only thing related to MyPrintScreen I found was it does get added to a Run key in the registry, to start every time Windows does. Another thing I didn't like, though it can be justified I suppose is Windows group policy is set to "I g n o r e F r a m e A p p r o v a l C h e c k "... It can be used to more silently add a browser plug-in or add-on, but I worry that that could be exploited by something else -- maybe not, but I tend to error on the side of worrying. :) At any rate, search on that to find the registry entries, while the 2 new files are "Registry.pol" in a subfolder of Windows & "ntuser.pol" in a user subfolder. McAfee also stopped the connection to 217.23.8.104 in the Netherlands -- note that the site data has changed from what it showed a couple of hours ago, so they may be in the process of (re)evaluating given all the activity that's likely going on because of the GOTD, so something you might want to recheck later. Personally I didn't like the SoundFrost service that's set to start with Windows, starts with the app, & stays running after SoundFrost is closed, since it continuously uses a very small amount of resources rather than staying dormant -- that's likely not a problem really, except I just don't like that sort of thing [get enough apps/services doing that & it adds up, so I tend to nip it in the bud].
Finally & only a little bit related, Sony Creative came out with this article that, while it hawks their Sound Forge app, does explain some basic principles of digital audio that are rarely if ever dealt with on-line... http://www.sonycreativesoftware.com/basic_definitions_of_digital_audio
