C4 could use slightly larger spacing - C7 is a connection on the mid surdos.
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A trill, generally three very fast notes on repique/caixa, two or three for surdos Common break specific to Samba Reggae 2 and 13 removed for voltage clearance (UCC256301, https://www.ti.com/lit/ds/symlink/ucc256301.pdf SOIC, 14 Pin (JEDEC MO-194 Var AB https://www.jedec.org/document_search?search_api_views_fulltext=MO-194), generated with kicad-footprint-generator Mounting Hardware, inside through hole M2, height 4, Wuerth electronics 9776060960 (https://katalog.we-online.com/em/datasheet/9776060960.pdf), generated with kicad-footprint-generator Fuse SMD 1812 (4532 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size from: http://www.kemet.com/Lists/ProductCatalog/Attachments/253/KEM_TC101_STD.pdf), generated with kicad-footprint-generator JST PH series connector, SM02B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator XP_POWER IAxxxxD DIP DCDC-Converter XP_POWER IAxxxxD, DIP, (https://www.xppower.com/pdfs/SF_IA.pdf), generated with kicad-footprint-generator JST PHD series connector, 501331-0207 (http://www.molex.com/pdm_docs/sd/5013310207_sd.pdf), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: A-41791-0005 example for new mpn: 39-28-x12x, 6 Pins per row (http://www.molex.com/pdm_docs/sd/1053091203_sd.pdf), generated with kicad-footprint-generator Diode SMD 0603 (1608 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator JST PUD series connector, B04B-ZESK-1D, with boss (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator JST XH series connector, BM17B-SURS-TF (http://www.jst-mfg.com/product/pdf/eng/eSUR.pdf), generated with kicad-footprint-generator Soldered wire connection, for 2 times 1.5 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 2.3mm, size source Multi-Contact FLEXI-xV 2.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, old mpn/engineering number: 5566-08A, example for new part number: 26-60-5120, 12 Pins per row (https://cdn.harwin.com/pdfs/M20-781.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py EQFP, 144 Pin (https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/packaging/04r00476-02.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-125-02-xx-DV-TE, 25 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0834-6-81&productname=DF12E(3.0)-50DP-0.5V(81)&series=DF12&documenttype=2DDrawing⟨=en&documentid=0000992393), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, FH12-12S-0.5SH, 12 Pins (http://www.molex.com/pdm_docs/sd/559320210_sd.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, DF3EA-05P-2H (https://www.hirose.com/product/document?clcode=CL0543-0332-0-51&productname=DF3EA-5P-2H(51)&series=DF3&documenttype=2DDrawing⟨=en&documentid=0001163317), generated with kicad-footprint-generator JST XH series connector, B4PS-VH (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py MSOP, 8 Pin (https://media.digikey.com/pdf/Data%20Sheets/Rohm%20PDFs/BD9G341EFJ.pdf), generated with kicad-footprint-generator Harwin Male Horizontal Surface Mount Fuse, 3 x switching (normalling) stereo jack without switching contact, vertical PCB mount, replaces NL8MD-V-1, https://www.neutrik.com/en/product/nl8mdxx-v-3 speakON Chassis Connectors, 4 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc3fbv2 AA Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, vertical PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 6.25u PCB Cherry MX keyswitch 2.00u vertical plate Cherry MX keyswitch 1.00u PCB Cherry MX keyswitch 6.25u plate Cherry MX keyswitch 2.00u vertical plate Cherry MX keyswitch ISO enter 4-bit rotary coded switch, gull wing, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf 4-bit rotary coded switch, gull wing, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf 4-bit rotary coded.