A roughly square purple coloured PCB with white silkscreen. It is populated with smd components (resistors, capacitors, ICs, diodes) and 16 bright blue rectangular trimmer potentiometers, all arranged in a 3x3 matrix.
https://mastodon.sdf.org/system/media_attachments/files/113/107/585/877/942/247/original/1f561b63d046931f.jpeg