In MMD 030116 Tony Dellaway asked for "some suitable sound restoration
software for the Macintosh that does not cost megabucks".

The best solution for amateur application (and much more!) I know
about is "Amadeus".  I have been using "Amadeus" for many years and
I can tell you that, concerning functionality, reliability, support,
continuous upgrades and price, this software is really great!

The author of "Amadeus" is

  Martin Hairer
  19, ch. des Cypres
  CH-1226 Thonex
  Switzerland

and you can get this software for 25 US$.  The easiest way is to
download "Amadeus" from  http://www.hairersoft.com/Amadeus.html
Then test it and pay the 25 bucks on-line.

Greetings from Germany
Christian Greinacher