Some examples of recordings, with and without processing by Mono-a-Mono, are available on The Internet Archive (just search for “Mono-a-Mono”), and you can listen to a bunch of vintage 78s, processed by Mono-a-Mono, in full, on my personal site. There’s also a useful in-depth review, written by a professional engineer who actually knows what he’s talking about, at the TDL Technology site.

To get a quick idea just how effective Mono-a-Mono can be at removing noise, try the extracts below. They’re from four 78 rpm records dated between 1930 and 1950. For each one, there are two files, one “unprocessed”, and one “cleaned” with Mono-a-Mono. The “unprocessed” files are the original stereo recordings used as input to Mono-a-Mono, but converted to mono and stored in MP3 format. The “cleaned” files are the corresponding outputs of Mono-a-Mono, simply converted to MP3 format. Take a listen, and see what you think…

For the “cleaned” files, Mono-a-Mono’s lift parameters were set to give approximately the correct equalisation, based on the record label and information published on the internet. The hiss filter was set according to the approximate age of the recording (8 kHz for the early 1930s, increasing to 14 kHz or so for the 1950s). The rumble filter was set to 20 Hz, and the other controls were left at their default values.