Check the listing for details. 3D printed keyboard for Korg Monotron, Duo, Delay. Condition: New. Listed at 9.98 USD. Demo Video This 3D printed attachment makes the Korg Monotron's ribbon keyboard much easier to play by adding tactile keys. It fits all three Monotron models: Original, Duo, and Delay. This attachment allows for greater precision and reduces the time needed to competently play a melody. Also, it helps train your fingers to make Monotrons easier to play without the attachment. After using this tool for months I never want to play a Monotron without it. I personally test every print. Here are some things to note about this item: First, this listing is for a 3D printed attachment, NOT a Korg Monotron synthesizer. The attachment consists of two parts: a key tree that sits atop the ribbon controller and a retainer that wraps around the device to hold the keys in place. Second, while the Monotron Duo has a mode for discrete notes, the Original and Delay models do not. The Monotron Original's keyboard range is slightly over an octave, but the intonation is far from perfect. This keyboard attachment will not give you perfectly in-tune notes. However, it is possible to adjust the pitch in such a way that it is perfectly usable. The attachment will not let you play a traditional scale on the Delay model, but it will make what you play more consistent. Third, this attachment is a 3D printed plastic part and as such will sometimes have small imperfections. Also, the part is relatively fragile if subject to abuse. Don't expect it to survive being stepped on, thrown across the room, or survive extreme temperatures. If used sensibly this keyboard should last a long time (I've used one for months, switching often between my three Monotrons with hours of playing and it is durable).Discount is available when ordering two or more, just tell me which colors you want. If you are interested a deeply discounted keyboard, send me a message. I sometimes have working prints with cosmetic flaws such as discoloration or small deformities. Also, I occasionally have different unlisted colors. "Rib-Keyz" is co-designed and printed by Inventimark