Marvin Pavilion is a Japanese freeware VST instrument developer specializing in emulations of classic analog drum machines and compact virtual synthesizers for Windows. The plugins are built in SynthEdit and distributed at no cost through the developer's site. Credits on the project list the design to Found K, with the catalog dating back to the mid-2000s.

The brand is best known for its Tromine family of drum synths, which spans multiple variants modeled on vintage Roland gear — including Tromine C (inspired by the CR-78), Tromine 8 (TR-808 style), Tromine 9 (TR-909 style), along with Tromine Z, Tromine 6, Tromine GT, and reTromine. Each instrument exposes per-voice tune and decay parameters alongside a simple stereo limiter. The drum-synth lineup is rounded out by single-voice modules such as BDX (bass drum), SDX (snare), HCX (hand clap), and Trokow, plus the Hexagon '85 percussion instrument.

On the synth side, the developer offers Synthestra, a monophonic analog-style instrument with a single oscillator plus sub-oscillator, low-pass filter with envelope and LFO, and an ADSR VCA; Full Synthestra expands it to a two-oscillator design. Casiopea is a phase-distortion synthesizer inspired by the Casio CZ series, and HS9 is another small-footprint synth. The tools are aimed at producers looking for lightweight, zero-cost vintage-flavored sounds rather than polished commercial plugins.

Marvin Pavilion has 5 products cataloged on Equipboard, including Drum Machine and Synth Plugins. Their gear is featured by 1 artist, with the strongest followings in Electronic, Rock, and Hip Hop. Notable users include emma essex.