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To online 8-note schematic, or extend MK's 5-note to 8-note. Expanding out to 8 (or 10?) Breadboard MK's 5-note to 8-note. Expanding out to 8 notes means ~$16-20 in parts, two tl074 op amps and otherwise a bunch of diodes and support Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the following disclaimer in the Source Code Form that is 3 or greater. *When noting prices, mark whether this 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 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN AN ACTION OF TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE ISC License Copyright.

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