FOCUSRITE ISA 428 Microphone Preamp Early Model Overhauled A 4-channel microphone preamplifier that inherits the traditional ISA sound. Early model with VU meters. Extremely rare. There is a crack in the 1-channel meter window due to the cable terminals hitting it, and there are some minor scratches and other signs of use, but the lights also illuminate and there is no major damage, and all channels are working well. I mainly used it for drum recording. The recorded sound is plump and has a thick feel. It's somewhere between SSL and Neve. It gives the impression of amplifying the sound mildly without any quirks, making it very easy to use. I found it very useful for vocals, acoustic guitar, drum recording, and re-tracking from a DAW. I am selling it as I replace studio equipment to introduce a new preamplifier.