I thought the same, until I turned up the input a bit. Higher than unity. I get it so at least every pluck registers one light on there now.
Killer pedal if you want a compressor that doesnt muck around with your tone and does what a SS compressor should.
Darkglass Club #8, Club Verellen #19, Fuzzrocious #151, Gallien-Krueger Club #916, Team Trace Elliot #208