Nothing screams Big Apple like a little parallel compression, also known fondly as “New York” compression, thanks to its birth among a small coterie of Manhattan-based engineers. The New York Parallel Compression Technique But you know the old maxim, “If it sounds good, it is good!” It may be best used on legato vocals, strings, and horns. The LA-2 model captures the mojo of one of the very earliest Teletronix units, offering the slowest response time and a distinctive 'mellow' sound owing to its 50-year-old luminescent panel.The Gray model, paying homage to Jim Lawrence's original mid-‘60s Pasadena-built units, is typically used for material requiring a medium-speed compression - think lead and background vocals, keyboards, and (judiciously) acoustic and electric guitars.This makes it a versatile performer that's suitable for the widest variety of applications - including drums, percussion, and bass guitar. The UREI-built Silver LA-2A is generally appreciated for its faster time constant and its treatment of transients.The Teletronix LA-2A Classic Leveler Collection includes units from three different LA-2A eras - Gray, Silver, and the original LA-2. The LA-2A Collection – Three Different Flavors