Launch Intel
Ne

Nevertwenty a novel approach to chord synthesis

Hacker News

Nevertwenty a novel approach to chord synthesis

I play piano and I built this for myself recently. Type a song, hit play, and the chords come at you on the beat. It's Rock Band for real instruments: the chord you need is the one under the playhead. I've almost got the entire music database here. I dare you to find a public track that isn't in here. Catalog is 6.8M songs / 103k artists. Librosa beat detection. ONNX graph combined with my custom tuned BTC. Bass notes processed independently. Median over 4536 cold runs: 2.15s to decode, 122x realtime. Download is the slow part at 8.4s median. Moving the audio is the bottleneck. MP3 search is a fancy matching algorithm; if the song is on the internet it'll find it. It was hard to make this pipeline run fast! Should probably stream the audio instead. But I have to change the entire pipeline arch to allow it. Will continue trying. The GTA6 of RockBand play along v1 "I can sight-read along to songs I've never heard now. That isn't a thing I could do a year ago, and I didn't get there by practicing." said the computer

Visit productView on Hacker NewsSep 8, 2026
Share card

Actual performance

1points
1comments
Did not reach leaderboard

Launch Intel predictions

Analyze your own launch →
Indie HackersFits the IH revenue-focused audience · Strong signals: songs · Missing: supports, reddit linkedin, podcasting
88%88% predicted probability of success on Indie Hackers, based on ML models trained on real launch data.
best fitHighest predicted score across all platforms for this description.
Hacker NewsStrong engagement from HN community · Strong signals: pipe, io · Missing: https docs, excited, just released
63%63% predicted probability of success on Hacker News, based on ML models trained on real launch data.
nativeThis product was originally launched on this platform.
TrustMRRFits verified-revenue profile · Missing: mobile apps, ios, personal
63%63% predicted probability of success on TrustMRR, based on ML models trained on real launch data.
Product HuntOn track for Day 1 leaderboard · Strong signals: computer, notes, code · Missing: mac, agents, macos
54%54% predicted probability of success on Product Hunt, based on ML models trained on real launch data.
AppSumoMay struggle as an AppSumo deal · Missing: plus, platform, intuitive
36%36% predicted probability of success on AppSumo, based on ML models trained on real launch data.
Acquire.comPre-revenue stage for this audience · Missing: arr, mrr, revenue
20%20% predicted probability of success on Acquire.com, based on ML models trained on real launch data.
BetaListMay not resonate with beta-testers · Strong signals: audio · Missing: web3, chat, crypto
0%0% predicted probability of success on BetaList, based on ML models trained on real launch data.

Incorrect prediction on native model

Similar products

De
Decrypting Rita, a graphic novel75%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Decrypting Rita, a graphic novel

Hacker News4
Am
American Apocalypse (Novel) (2004)64%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

American Apocalypse (Novel) (2004)

Hacker News1
4
4 yrs ago, I wrote an AI novel, now I published & made it free39%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

4 yrs ago, I wrote an AI novel, now I published & made it free

Hacker News2
Ty
TypistStories, new Gothic novel released36%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

TypistStories, new Gothic novel released

Hacker News2
(g
(gr)album – graphic novel + music album44%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

(gr)album – graphic novel + music album

Hacker News2
A
A Novel Method for Implementing Usernames in Cryptocurrencies [pdf]41%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

A Novel Method for Implementing Usernames in Cryptocurrencies [pdf]

Hacker News2
Ch
Chronograph – reactive computational engine with novel properties42%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Chronograph – reactive computational engine with novel properties

Hacker News3
NOWATA soap
NOWATA soap23%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

NOWATA™ soap. Novel no-rinse, no-wipe all natural soap.

Product Hunt+9
No
Novel Novel Generator. Recursive Gemini pl wrote 97p coherent nerdy pdf40%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Novel Novel Generator. Recursive Gemini pl wrote 97p coherent nerdy pdf

Hacker News3
Pa
Pasteify, a novel photo app39%Launch Intel prediction score: how likely this product is to succeed on its source platform, based on its name, tagline, and description.

Pasteify, a novel photo app

Hacker News2
Browse all productsAnalyze your launch