This is a schematic for a modified version of the Dan Armstrong Orange Squeezer compressor. All of the mods came from a discussion at DIY Stompboxes. The original objective was to optimize the circuit for bass guitar by replacing the half-wave rectifier with a full-wave rectifier, among other mods as noted on the schematic.
I have not built this circuit, myself. But there have been a number of reports at DIY Stompboxes over the years. Reviews are mixed. Some feel that the stock version of the Orange Squeezer is as good as it gets.