bobbicodes

@bobbicodes.bsky.social

102 Followers 64 Following

Programmer ♾️ chiptune composer 🏳️‍⚧️ she/her Lisp, Clojure, 6502 assembly, Web dev Author of LispyTunes: https://codeberg.org/bobbicodes/LispyTunes Main channei: https://www.youtube.com/@bobbiCodes Music channel: https://www.youtube.com/@bobbiChips

A sea of different colored notes scrolling by in a piano roll editor. The yellow notes are rendered from an imported midi file and are unheard, to be used as an alignment guide for easily creating accurate covers. The highlighted notes are the automated arpeggios, where instances of polyphony are converted into rapid cycles of frequency interval offsets.
A piano roll editor in which I load a series of simple test cases, then attempt to play a standard MIDI file of the 2001 A Space Odyssey theme
A scrolling music grid with sequenced notes superimposed
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.
Demonstrating the pitch slide feature in the piano roll editor. The slides are rendered as translucent triangles connecting the note start to the target pitch.
A note drawn in a piano roll sequencer, with a transparent triangle indicating that it is a slide note, with a handle that can be dragged to set the target pitch. The animation demonstrates the interaction.
A piano roll music composition interface shown on a web page, with the keyboard on the left and a few notes on the grid. The right sidebar is going to be the instrument UI, which currently displays a single instrument which is a plain square and a default envelope setting. At the top are controls for loading and saving projects, hardware export, and navigating the grid. Finally on the bottom is a play and stop button.
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
A 6502 assembly instruction using the zero page y addressing mode.
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.