Manufacturing feasibility assessment
5. Verdict
A universal platform cannot reliably sense per-key pitch, pressure, and timbre across arbitrary keyboards; target $150–300 is incompatible, so pivot to a defined keybed or supported-model retrofit.
6. Subsystems
- 6.1 Key-identification sensingHIGH
- 6.2 Per-note expression captureHIGH
- 6.3 Feedback actuationHIGH
- 6.4 Mechanical interfaceHIGH
- 6.5 MIDI/MPE firmwareMEDIUM
- 6.6 Power and enclosureMEDIUM
7. Bill of materials
| Item | 100 | 1,000 | 10,000 |
|---|---|---|---|
| 7.1 24-channel key-position/force sensing assembly | $42–58 | $29–40 | $21–30 |
| 7.2 24-channel haptic actuator array and drivers | $38–55 | $26–38 | $19–29 |
| 7.3 MCU, USB-MIDI interface and memory | $9–14 | $6–9 | $4–6 |
| 7.4 Power management, USB-C and protection | $8–12 | $5–8 | $3.50–5.50 |
| 7.5 Rigid sensor deck, mechanical stack and fasteners | $34–52 | $22–34 | $15–24 |
| 7.6 Enclosure, feet and cosmetic parts | $18–28 | $11–18 | $7–12 |
| 7.7 PCB, flex circuits, assembly and test | $32–48 | $20–31 | $13–21 |
| 7.8 Packaging, cable, manual and allowance | $10–15 | $7–10 | $5–8 |
At 10k units, tooling adds roughly $18–38 per unit before financing and yield loss. With estimated $88–136 BOM at 10k, the product cannot support a $150 target and remains margin-constrained even near $300.
8. Gates to clear
8.1 [DFM]
The core claim is blocked: an under-keyboard platform has no universal, repeatable way to determine individual key identity and per-note pressure during chords across arbitrary two-octave keyboards.
Path: Viability requires a keyboard-specific retrofit: access the keyboard scan matrix or replace its keybed with an instrumented 24-key FSR/Hall-effect keybed, then calibrate per model rather than support any keyboard.
8.2 [Certification]
A global USB electronic product with actuator drive requires CE/UKCA EMC and RoHS, FCC Part 15 in the US, and typically ISED Canada testing; mechanical and USB power behavior must be stable first.
Path: After a defined electrical and mechanical architecture, use an accredited EMC lab for CE/UKCA EMC, FCC Part 15 and ISED testing, supported by RoHS material declarations and pre-compliance conducted/radiated emissions scans.
8.3 [Tooling]
The 24-channel sensing and feedback stack is estimated at $88–136 BOM at 10k before warranty, freight, channel margin and tooling amortisation; it misses the low-end retail cost structure.
Path: Change the offer to a dedicated 24-key MPE controller or a limited set of licensed keyboard-specific retrofit kits, remove per-key feedback where possible, and validate a landed-BOM target below $60–90 before production tooling.
9. Prototype sequence
- 9.1Select one specific 24-key donor keyboard and map its key scan matrix, travel, force curve and underside geometry.This tests whether note identity can be obtained from the keyboard itself rather than inferred from an external platform.
- 9.2Build a 24-key instrumented test keybed with per-key position/force sensing and USB-MIDI MPE firmware.It establishes the sensing accuracy, chord handling and latency required for genuine per-note MPE output.
- 9.3Run blind playing tests with simultaneous chords, repeated notes, aftertouch and pitch gestures against a reference MPE controller.This exposes false note assignment, crosstalk, latency and feel failures before enclosure investment.
- 9.4Prototype feedback on three to six keys using the intended actuator type and measure audible noise, heat and added key resistance.Feedback feasibility must be proven without degrading normal keyboard action or creating unacceptable stage noise.
- 9.5Only if the single-model retrofit passes, quote keyboard-specific mechanics and conduct EMC pre-compliance on the defined architecture.This converts the concept into a supportable product scope and prevents tooling a universal platform with no reliable sensing path.
Assessment criteria: J. Tanikella · Engine: GPT-5.6 Terra.
