iiinova — where your digital self keeps evolving

bobbicodes @bobbicodes.bsky.social · 01/09/2026

unfinished cover of Prokofiev Toccata in D #SID i don't think i've shared this one here yet but figured i'll post this now because i just started working so who knows when i'll get around to finishing it

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bobbicodes @bobbicodes.bsky.social · 16/08/2026

Jurassic Park Theme (John Williams) #SID

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bobbicodes @bobbicodes.bsky.social · 20/07/2026

Seems like this feature basically works

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bobbicodes @bobbicodes.bsky.social · 16/07/2026

trying to make an auto-arpeggio feature for handling polyphony in the piano roll... it's right at the beautiful "failing hilariously" stage oh but midi import works which is neat, that's how i got the failing test data in there

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bobbicodes @bobbicodes.bsky.social · 14/07/2026

Demonstrating audio waveform overlay feature in #sid piano roll editor

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bobbicodes @bobbicodes.bsky.social · 13/07/2026

made it so you can import an audio file in order to match grooves

A piano roll editor as would appear in a digital audio workstation. Superimposed on the grid is the waveform of an imported audio file, with magenta bars overlayed in the sequencer representing the copied drum groove.

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bobbicodes @bobbicodes.bsky.social · 07/07/2026

got it looking and feeling quite a bit better

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bobbicodes @bobbicodes.bsky.social · 07/07/2026

spent way longer than i should have to implement slide notes

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bobbicodes @bobbicodes.bsky.social · 05/07/2026

by adding arpeggios, we can finally make drums

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bobbicodes @bobbicodes.bsky.social · 04/07/2026

Added filter cutoff macros, can almost make music with this now

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bobbicodes @bobbicodes.bsky.social · 07/03/2026

Wrote my own renderer, replacing the Cairo graphics library with 87 lines of JavaScript codeberg.org/bobbicodes/s...

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bobbicodes @bobbicodes.bsky.social · 01/03/2026

Scarlatti Harpsichord Sonata k.420 (SID)

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bobbicodes @bobbicodes.bsky.social · 13/02/2026

A/B test of identity phase locking in phase vocoder based time stretching algorithm. This eliminates the artifacts typically introduced due to vertical phase discontinuities. See the paper "Phase Vocoder Done Right" by Zdenek Pruša and Nicki Holighaus: arxiv.org/pdf/2202.07382

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bobbicodes @bobbicodes.bsky.social · 03/02/2026

Making an N163 resampler webapp codeberg.org/bobbicodes/n...

A web page with a button to load an audio file, set of input fields for wave size, wave count and resample period and text area for the wave output data. Below it is a graph showing the resampled PCM data as a white line and purple shading for the N163 wavetable values ranging from 0 to 15

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bobbicodes @bobbicodes.bsky.social · 30/01/2026

Made it so you can add/remove code blocks for driver customization codeberg.org/bobbicodes/n...

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bobbicodes @bobbicodes.bsky.social · 28/01/2026

Made another big improvement to the live SID scopes. The emulator now manages all the resampling and triggering in order to minimize the amount of data being sent between threads, and make the rendering as smooth as possible, at least for a webapp running in real time.

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bobbicodes @bobbicodes.bsky.social · 24/01/2026

Finally finished adding Namco 163 support and hooking it up to the viewers codeberg.org/bobbicodes/n...

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bobbicodes @bobbicodes.bsky.social · 22/01/2026

messing with the Super Mario Bros. music engine to put it in a minor key

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bobbicodes @bobbicodes.bsky.social · 18/01/2026

Got the Famistudio driver working in the nerdy6502 editor. This opens up a lot of possibilities because it supports every expansion and is way more efficient, both in CPU and rom space

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bobbicodes @bobbicodes.bsky.social · 05/01/2026

Isn't that what I'm doing here in the fetch routine? I've got the assembler code open now, so if there's a bug I'll try to fix it.

A 6502 assembly instruction using the zero page y addressing mode.

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bobbicodes @bobbicodes.bsky.social · 04/01/2026

Cover of Vegetable Valley from Kirby's Adventure (NES), to test my new DPCM implementation in Nerdy6502

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bobbicodes @bobbicodes.bsky.social · 31/12/2025

ok how about I just put the tracker in the program that works, lol

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bobbicodes @bobbicodes.bsky.social · 31/12/2025

It's obviously running like absolute shit but I've got the tracker viewer rendering, sort of

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bobbicodes @bobbicodes.bsky.social · 30/12/2025

Successfully moved the SID emulator to a Web worker, now all data is processed in a separate thread, the audio and oscilloscope buffers are sent using Transferable objects and the text for the tracker is messaged over each frame which completely fixed the UI stuttering as far as I can tell.

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bobbicodes @bobbicodes.bsky.social · 27/12/2025

put scopes in the tracker viewer

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bobbicodes @bobbicodes.bsky.social · 26/12/2025

here's most of the second half of the tune

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bobbicodes @bobbicodes.bsky.social · 25/12/2025

WIP SID cover of Nemesis, the Warlock by Rob Hubbard

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bobbicodes @bobbicodes.bsky.social · 19/12/2025

Made a tracker-style register viewer for my SID player codeberg.org/bobbicodes/sid

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bobbicodes @bobbicodes.bsky.social · 20/10/2025

learning to use the pokey "filter" a little bit, lol

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bobbicodes @bobbicodes.bsky.social · 17/10/2025

Took an entire day to get it basically working but I'm shocked that it does, that was really hard to figure out The timing is off for some reason, it might be a sample rate mismatch, or I might just not be syncing the CPU with the playback engine properly

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bobbicodes @bobbicodes.bsky.social · 16/10/2025

Developing the POKEY editor now, got basic stuff working, load/save project files, SAP export. I'm gonna make a built-in oscilloscope viewer next

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bobbicodes @bobbicodes.bsky.social · 03/10/2025

SID port of one of my originals, "Catch the Wave" (WIP)

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bobbicodes @bobbicodes.bsky.social · 24/08/2025

Added a bunch of i/o stuff to start moving it towards a proper SID editor. Uses simple JSON for loading/saving the entire project state. SID export is a no-brainer because the assembler output is already a SID file. WAV export auto-detects song length. bobbicodes.codeberg.page/nerdySID/

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bobbicodes @bobbicodes.bsky.social · 20/08/2025

Added arpeggios, using them here for the chords and drums. Also added the debugger to the live app: bobbicodes.codeberg.page/nerdySID/

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bobbicodes @bobbicodes.bsky.social · 18/08/2025

The interactive SID tutorial is getting a built-in step debugger

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bobbicodes @bobbicodes.bsky.social · 16/08/2025

Uploaded lesson 9: Modulation to NerdySID Adds vibrato, PWM, filter sweep (oh my!) bobbicodes.codeberg.page/nerdySID/

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bobbicodes @bobbicodes.bsky.social · 13/08/2025

Preview of next SID driver lesson, which will add automated wave sequences, vibrato, PWM and filter sweep

NerdySID Interactive C64 SID tutorial
Lesson 9: Modulations

So far, to have parameters change over time requires setting them manually via opcodes. For things like vibrato, pulse width modulation and filter sweeps, this would end up spending a considerable amount of bytecode and also obscure the intent of our composition with register spam. Our solution will be to create routines which automate variables over the course of the note, either by reading values from a table (in the case of wave/control changes), or by way of speed/width parameters (vibrato, PWM and filter sweep). This will make our song section simple once again, and we can then use macros which will set up the instrument by selecting a particular set of automations.

We have 2 new subroutines, set wave sequence and set duty. The first of which indexes into a table of sequences to be written to the control register, advances to the next step and stores the value. The second routine is cropped out of the screenshot, but it handles the pulse width modulation according to the current duty value, center, direction, speed and width variables.

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bobbicodes @bobbicodes.bsky.social · 13/08/2025

I published the SID tutorial, with the newest lesson showing how to create instruments using assembler macros! bobbicodes.codeberg.page/nerdySID/

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bobbicodes @bobbicodes.bsky.social · 11/08/2025

Added opcodes to the engine so sound parameters can be changed during the song. Next step I'm gonna change the note durations to be represented in a number of ticks instead of fractional lengths, because what we really need to create proper instruments is precise frame-level control.

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bobbicodes @bobbicodes.bsky.social · 09/08/2025

The pokey driver went so swimmingly that now I'm using the same template for the SID

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bobbicodes @bobbicodes.bsky.social · 08/08/2025

Up to lesson 6, now supports multiple streams and note lengths

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bobbicodes @bobbicodes.bsky.social · 08/08/2025

Figuring out how to make a POKEY driver by adapting my interactive NES tutorial, which builds a simple sound engine in the browser in several incremental steps. I'm up to lesson 4, which plays a sequence of notes of equal length.

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