The PYE 4061S Stereo Levelling Amplifier is a dual‑channel analogue feed‑forward limiter/compressor for stereo mastering and loudness control. It uses transformer‑balanced XLR and 6.3 mm TRS inputs and outputs, with gain make‑up, adjustable attack and release for tight transient handling, and a width/balance matrix. Illuminated meters aid monitoring; a compressor bypass is available. Power: 95–245 VAC, 5 W max; weight 2.8 kg.