# Teensy 4.1 DIY Synthesizer **URL:** \ **Category:** MIDIbox User Projects\ **Tags:** synthesizer, diy-synth\ **Created:** [February 18, 2021, 6:37am UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985 "2021-02-18T06:37:36Z")\ **Posts on this page:** 15\ **Page:** 3
**Author:** ![rolfdegen](https://forum.midibox.org/user_avatar/forum.midibox.org/rolfdegen/32/357_2.png) [@rolfdegen](https://forum.midibox.org/u/rolfdegen)\ **Post date:** [April 20, 2023, 7:01pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/41 "2023-04-20T19:01:11Z")
The display had a protective film with a green tab ? Oh I saw. It is blue ! ---
**Author:** ![rolfdegen](https://forum.midibox.org/user_avatar/forum.midibox.org/rolfdegen/32/357_2.png) [@rolfdegen](https://forum.midibox.org/u/rolfdegen)\ **Post date:** [April 20, 2023, 7:13pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/42 "2023-04-20T19:13:56Z")
Mmm.. Protective film for Display ST7735 and ST7735S is normal black or green. Blue is not right !? ---
**Author:** ![rolfdegen](https://forum.midibox.org/user_avatar/forum.midibox.org/rolfdegen/32/357_2.png) [@rolfdegen](https://forum.midibox.org/u/rolfdegen)\ **Post date:** [April 20, 2023, 8:06pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/43 "2023-04-20T20:06:24Z")
I found a display with the same problem. I can now try to eliminate the error 🙂 ![Screen.jpg.9e1188b00e1d151b10e3fa8a3122a45f.jpg](https://forum.midibox.org/uploads/default/original/2X/8/8cc6f94c04d2d78aaadac656e3645c9f2fe95cee.jpeg) ---
**Author:** ![TAGalex](https://forum.midibox.org/letter_avatar_proxy/v4/letter/t/8baadc/32.png) [@TAGalex](https://forum.midibox.org/u/TAGalex)\ **Post date:** [April 21, 2023, 6:32am UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/44 "2023-04-21T06:32:50Z")
Good morning Rolf. Thank you very much for your help, it almost happened - the beginning is shifted and the number of pixels is inaccurate. ![IMG0823.JPG.f1f2db34693578e4be9dc812a384f78a.JPG](https://forum.midibox.org/uploads/default/original/2X/3/39559f25b13d28afc8262698095cd10840f65491.jpeg) ---
**Author:** ![rolfdegen](https://forum.midibox.org/user_avatar/forum.midibox.org/rolfdegen/32/357_2.png) [@rolfdegen](https://forum.midibox.org/u/rolfdegen)\ **Post date:** [April 21, 2023, 2:41pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/45 "2023-04-21T14:41:43Z")
Hello Alex. Here is a new Jeannie Firmware 2.21 ST7735S version. I hope your display problem is solved 🙂 ![20230421161835.jpg.59022bad749932d086e3a4005d1e4868.jpg](https://forum.midibox.org/uploads/default/original/2X/d/d4781018f0531bc9a19a80ba6900887cf700aa8d.jpeg)   Change display code in the ST7735\_t3.cpp file ``` // Initialization for ST7735R screens (green or red tabs) void ST7735\_t3::initR(uint8\_t options) { commonInit(Rcmd1); if (options == INITR\_GREENTAB) { commandList(Rcmd2green); \_colstart = 2; \_rowstart = 1; } else if(options == INITR\_144GREENTAB) { \_screenHeight = ST7735\_TFTHEIGHT\_144; commandList(Rcmd2green144); \_colstart = 2; \_rowstart = 3; } else if(options == INITR\_144GREENTAB\_OFFSET) { \_screenHeight = ST7735\_TFTHEIGHT\_144; commandList(Rcmd2green144); \_colstart = 0; \_rowstart = 32; } else if(options == INITR\_MINI160x80) { \_screenHeight = ST7735\_TFTHEIGHT\_160; \_screenWidth = ST7735\_TFTWIDTH\_80; commandList(Rcmd2green160x80); \_colstart = 24; \_rowstart = 0; } else { // \_colstart, \_rowstart left at default '0' values commandList(Rcmd2red); } commandList(Rcmd3); // if black or mini, change MADCTL color filter if ((options == INITR\_BLACKTAB)|| (options == INITR\_MINI160x80)){ writecommand(ST7735\_MADCTL); writedata\_last(0xC0); \_colstart = -2;// only for ST7735S \_rowstart = -1;// only for ST7735S } tabcolor = options; setRotation(0); } ```   Greetings from germany. Rolf ---
**Author:** ![TAGalex](https://forum.midibox.org/letter_avatar_proxy/v4/letter/t/8baadc/32.png) [@TAGalex](https://forum.midibox.org/u/TAGalex)\ **Post date:** [April 21, 2023, 2:59pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/46 "2023-04-21T14:59:34Z")
Thank you very much. But I can’t compile the project - it constantly gives an error SD ---
**Author:** ![rolfdegen](https://forum.midibox.org/user_avatar/forum.midibox.org/rolfdegen/32/357_2.png) [@rolfdegen](https://forum.midibox.org/u/rolfdegen)\ **Post date:** [April 21, 2023, 3:02pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/47 "2023-04-21T15:02:24Z")
I have send you an email with hex-File 🙂 ---
**Author:** ![TAGalex](https://forum.midibox.org/letter_avatar_proxy/v4/letter/t/8baadc/32.png) [@TAGalex](https://forum.midibox.org/u/TAGalex)\ **Post date:** [April 21, 2023, 3:16pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/48 "2023-04-21T15:16:17Z")
Rolf, a huge thank you for your responsiveness and ability to help. If you are interested in the ppt I developed, I can download (only) gerber files for you. ![IMG0824.JPG.e85ee85a3dd7e3c97a4d53db6fa161d8.JPG](https://forum.midibox.org/uploads/default/original/2X/b/b5c8c29219a85c60a4571052e1f4f5c5d5e9dfc3.jpeg) ---
**Author:** ![rolfdegen](https://forum.midibox.org/user_avatar/forum.midibox.org/rolfdegen/32/357_2.png) [@rolfdegen](https://forum.midibox.org/u/rolfdegen)\ **Post date:** [April 22, 2023, 12:05pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/49 "2023-04-22T12:05:06Z")
I wish you a lot of fun with Jeannie. Large DIY block for the Jeannie and Updates.. Link:  [https://www.sequencer.de/synthesizer/threads/jeannie-polyphonic-diy-synthesizer.160564/page-46](https://www.sequencer.de/synthesizer/threads/jeannie-polyphonic-diy-synthesizer.160564/page-46) ---
**Author:** ![rolfdegen](https://forum.midibox.org/user_avatar/forum.midibox.org/rolfdegen/32/357_2.png) [@rolfdegen](https://forum.midibox.org/u/rolfdegen)\ **Post date:** [April 22, 2023, 12:06pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/50 "2023-04-22T12:06:44Z")
There is a new case for the Jeannie..   [https://www.ericasynths.lv/shop/enclosures/studio/tubeohm-instruments-jeannie-case/](https://www.ericasynths.lv/shop/enclosures/studio/tubeohm-instruments-jeannie-case/) ![Jeannie-DIY-01.jpg.4cbbe98bb3c8047d9acf1dd1151d1c7d.jpg](https://forum.midibox.org/uploads/default/original/2X/7/719648a63ef13c602ca936f4f22bc0901783deb5.jpeg)   With wooden side panel looks even better.. ![581454120JeannieScreen4.png.b362fc85ab785fe641e8589f8aa5d464.png](https://forum.midibox.org/uploads/default/original/2X/8/82e97489d08f12a828ab87053aa31b7b7479fe2a.jpeg) ---
**Author:** ![TAGalex](https://forum.midibox.org/letter_avatar_proxy/v4/letter/t/8baadc/32.png) [@TAGalex](https://forum.midibox.org/u/TAGalex)\ **Post date:** [April 22, 2023, 12:26pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/51 "2023-04-22T12:26:19Z")
Nice and finished. But I have a slightly different arrangement of controls and indications. But this design is good, I’ll take it for the basics, thanks. ---
**Author:** ![rolfdegen](https://forum.midibox.org/user_avatar/forum.midibox.org/rolfdegen/32/357_2.png) [@rolfdegen](https://forum.midibox.org/u/rolfdegen)\ **Post date:** [May 22, 2023, 2:13pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/52 "2023-05-22T14:13:05Z")
I’m building wooden side panels for Jeannie. My beautiful office has been transformed into a carpentry workshop. And who cleans up afterwards.. (: ![20230516184036.jpg.aae75574c83faf99f7e0519639c1d722.jpg](https://forum.midibox.org/uploads/default/original/2X/1/1d8c966eb79c9059972ca05450f0971afd661ea3.jpeg) ![20230516184103.jpg.e0ec88f1ba1b7d2fd6276c8eb1cd8674.jpg](https://forum.midibox.org/uploads/default/original/2X/9/94508cf4096fffecd4db2f5d1f58cf6d2cbfeda4.jpeg) ![20230516192917.jpg.d4d96b37ea6e5817f7be3b2a2ec790dc.jpg](https://forum.midibox.org/uploads/default/original/2X/1/1770711db55a0cb5ed0d249de97b172ccdd4ead8.jpeg) Jeannie with self-made wooden side panels.. ![20230519081902.jpg.11a83a8118c18e06ed26c4d25809d977.jpg](https://forum.midibox.org/uploads/default/original/2X/b/b05cc720cac0df677e1390fdde137d5c7d2dcd42.jpeg) ![20230518200809.jpg.4e13bbd6286fe1052dbd516446b952b2.jpg](https://forum.midibox.org/uploads/default/original/2X/3/3c6c2fa0e2943b8a46fc66ba0f127d04a12fba37.jpeg) ![Seite.jpg.84e444a50b9ac417d57bc56566fb7195.jpg](https://forum.midibox.org/uploads/default/original/2X/e/e27720c348f2cc6b8ce1d5e6ed2f5166eb8ffbcc.jpeg) ![20230518194109.jpg.efae952a0975bf9157c3209876f12c7c.jpg](https://forum.midibox.org/uploads/default/original/2X/e/ea2265cf937090f51e5149cff949adccda2629b9.jpeg) ---
**Author:** ![TAGalex](https://forum.midibox.org/letter_avatar_proxy/v4/letter/t/8baadc/32.png) [@TAGalex](https://forum.midibox.org/u/TAGalex)\ **Post date:** [August 6, 2023, 12:35pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/53 "2023-08-06T12:35:05Z")
Очень красиво и профессионально! А еще я хочу представить окончательную версию вашего гениального устройства в моей одноплатной версии. Very nice and professional! I also want to present the final version of your ingenious device in my single board version.   ![IMG0845.JPG.06abab4aae35bb5f6c781aebd5f3f98e.JPG](https://forum.midibox.org/uploads/default/original/2X/b/b9dd203f7ac96eeb504a632e4c109104d6e37be3.jpeg) ![IMG0846.JPG.bfb67bde65ca1530e990c6e5606d26da.JPG](https://forum.midibox.org/uploads/default/original/2X/e/ed44828d89a1afa38147286c95f23bc6966a5ac0.jpeg) ---
**Author:** ![rolfdegen](https://forum.midibox.org/user_avatar/forum.midibox.org/rolfdegen/32/357_2.png) [@rolfdegen](https://forum.midibox.org/u/rolfdegen)\ **Post date:** [November 9, 2023, 9:44pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/54 "2023-11-09T21:44:41Z")
Neue Jeannie Preview Beta Test-Ver. 2.81 Added more polyhonic synthesis from Mutable Braids and Shruthi Synthesizer - Braids VOWL: low-fi Vowel synthesis. PRM\_A : formant, PRM\_B : formant\_shift - Shruthi ZSAW: Phase-distortion sawtooth with filter sweep - Shruthi ZSYNC: - Shruthi ZTRI: - Shruthi ZRESO: - Shruthi ZPULS: - Shruthi Chrushed\_Sine: - Braids CSAW: no functions at the moment - Braids VOSM Sawtooth with 2 formants. PRM\_A : formant1 frequency, PRM\_B : formant2 frequency - Braids TOY Low-fi Circuit-bent sounds. PRM\_A : sample reduction, PRM\_B : bit toggling - Braids SuperSaw: Swarm of 7 sawtooths, PRM\_A: Detune, PRM\_B High-pass filter - Braids ZLPF : Direct synthesis of LP/Peaking/BP/HP filtered waveform - Braids ZPKF : PRM\_A: Cutoff frequency, PRM\_B: Waveshape - Braids ZBPF : - Braids ZHPF : Youtube: [https://youtu.be/SCL5GZZQ7MU](https://youtu.be/SCL5GZZQ7MU) Github: [https://github.com/rolfdegen/Jeannie-Open-source-Synthesizer](https://github.com/rolfdegen/Jeannie-Open-source-Synthesizer) Greetings from germany. Rolf 🙂 ![Screenshot-2023-11-09-224800.png](https://forum.midibox.org/uploads/default/original/3X/e/e/eefb24edcfbc1397cfd9171ca72f068e2e2ee4e4.jpeg) ---
**Author:** ![rolfdegen](https://forum.midibox.org/user_avatar/forum.midibox.org/rolfdegen/32/357_2.png) [@rolfdegen](https://forum.midibox.org/u/rolfdegen)\ **Post date:** [December 27, 2023, 3:29pm UTC](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985/55 "2023-12-27T15:29:17Z")
Jeannie can Wavetable I integrated the Wavetable Oscillator from Mutable instruments Braids into the Jeannie. The wavetable can be modulated with two parameters A and B. Youtube: WTX4 and little LFO modulation to wavetable position [![](https://forum.midibox.org/uploads/default/original/2X/4/426e64823c346907e733e0e817ebac793fdaf572.jpeg "Jeannie Polyhonic DIY Synthesizer Wavetable 2") ](https://www.youtube.com/watch?v=ssU4dMQZHXs)   ![Wavetable.png](https://forum.midibox.org/uploads/default/original/3X/a/7/a778ec2979703b6afdabca662563f23356fbd8c2.png) [Previous page](https://forum.midibox.org/t/teensy-4-1-diy-synthesizer/20985.md?page=2)