Note: It may be difficult to hear the differences on small, inexpensive speakers. If you are using a pop-up blocker, you may have to override it to allow a new window to open and play the sound.

78 RPM Restoration - Clicks, Pops and Hiss Removal
Reel to Reel - Hiss Removal
LP Restoration - Clicks and Pops Removal
Cassette Transfer Extreme Hiss Removal from an almost inaudible recording*

* The "Before" example is actually after we increased the volume of the tape so it could be heard. Of course, this brings up the noise level as well.  Also, the tape only contained audio on the right channel. We increased the level, converted it to mono so the audio would be centered and reduced the noise level as much as possible without completely removing the voice.