Your streamer is your source. Audiogravity is the conductor.
MPD, Roon, HQPlayer, AirPlay, UPnP — every player, every source, down to DSD and
Hi-Res PCM. Audiogravity coordinates each component of your stack, from the RT kernel to your
Qobuz
and Tidal libraries, without replacing any of them. One interface. Total control.
"The enemy of bit-perfect playback isn't the software. It's the kernel scheduler
interrupting your audio thread for 200 µs to handle a network IRQ."
Features
From the kernel to your Qobuz library.
Twelve modules orchestrating every layer of your streamer — RT kernel tuning,
service control, signal-path visualisation, unified transport across MPD, Roon, HQPlayer, AirPlay
and UPnP. Starter ships with the essentials; Pro unlocks the deep audio-engineering surface.
PRO
Unified transport across every player
One interface, one set of controls, every engine your streamer runs. Transport, volume, seek and
cover art on MPD, Roon, HQPlayer NAA, AirPlay and UPnP simultaneously. Live Hi-Fi readout —
format (PCM / DSD / MQA), sample rate, bit depth, instantaneous bitrate — refreshed on every
track change. Pick the output zone: Roon zone, UPnP renderer or ALSA port. Audiogravity
conducts; your engines play.
"Roon + HQPlayer" for serious listening. "MPD + upmpdcli" for UPnP. "AirPlay only" for background
music. Each profile lists exactly which services to start and stop — conflicts resolved
automatically. Atomic activation with detailed toast on failure.
Conflict resolution · atomic · history
PRO
Pin audio threads to dedicated CPU cores
SCHED_FIFO or SCHED_RR with priority 1–99. CPU affinity per service. MEMLOCK locks pages in RAM —
no swap during playback. All written as systemd drop-ins. Reversible. Upgrade-safe.
FIFO · RR · MEMLOCK · RTPRIO
PRO
µs-scale latency benchmarks
Cyclictest from the browser. Histograms at the microsecond — the definitive proof that your RT
kernel is operational, not just installed. Compare before/after, timestamped, archived.
cyclictest · iPerf3 · jitter histograms
PRO
Per-core governor control
Performance governor on audio cores, powersave elsewhere. Per-core thermal map. A
THROTTLED badge fires the instant the kernel reports throttling — before your ear hears
anything.
Performance · Powersave · thermal map
PRO
Edit audio service configs without breaking them
Form view for common settings (output, format, buffer). Raw CodeMirror editor with syntax
highlighting for JSON, INI, XML and libconfig. Live validation before save — syntax, existing
systemd units, circular dependencies, duplicates. Side-by-side diff. Automatic timestamped
backup before every change.
mpd.conf · roon · AirPlay · upmpdcli · live diff
PRO
Live signal-path visualisation
An interactive SVG graph of your entire Hi-Fi chain — source (NAS, UPnP, Qobuz, Tidal) through
every active audio process down to the DAC. Pan, zoom, minimap for complex topologies. Each
link shows the exact stream format (PCM / DSD / MQA · 44.1 kHz → 768 kHz · 16 → 32 bit), a
bit-perfect badge, per-link latency, and live play state. Click a link to hot-reroute MPD,
HQPlayer NAA or AirPlay to a different DAC — without interrupting playback.
DAG · pan · zoom · minimap · hot rerouting
PRO
High-resolution library
Browse Roon, MPD, MinimServer, upmpdcli, Qobuz and Tidal from one interface. Album view,
full-text search, queue management, output-zone picker. No separate client needed.
Qobuz and Tidal require an active subscription to their respective services.
Roon · MPD · UPnP · Qobuz · Tidal
STARTER
Service tile + 60 s sparklines
Live systemd state. Instantaneous CPU, memory, network and disk with LOW/MEDIUM/HIGH thresholds.
Expected throughput reference (CD ≈ 1.4 MB/s, Hi-Res ≈ 10 MB/s, DSD64 ≈ 22 MB/s). Uptime shown.
Live systemd · sparklines · uptime
STARTER
Complete audio device inventory
Every ALSA card, USB interface, subdevice and hardware capability your kernel sees — without
aplay -l or lsusb. Plus CPU, temperature, memory,
disk and network at a glance.
ALSA · USB · sub-devices · hardware caps
STARTER
WebAuthn passkeys
Face ID, Touch ID, fingerprint, YubiKey. Multiple devices per user, managed individually.
Role-based access — Admin, User, Guest — with session history.
FIDO2 · Face ID · YubiKey · RBAC
STARTER
Push notifications
Get notified the instant a critical service fails, a DAC disconnects, or temperature
crosses your threshold. Even when the PWA is closed.
Service down · DAC disconnect · Temperature · Background push
STARTER
Auto-discovery
Audiogravity scans your network on every reload. MPD instances, Roon Bridges, UPnP servers,
AirPlay receivers — all picked up automatically.
MPD · Roon · UPnP · AirPlay · SSDP
Now playing · HQPlayer NAA · DSD256
Shameika
Fiona Apple — Fetch the Bolt Cutters
Roon → HQPlayer → Heed Abacus S → Naim Nac 52 / Nap 250
iPhone 15→Roon Core→HQPlayer NAA→Heed Abacus→Naim Nac 52 / Nap 250
Audio pipeline · Pro
Every device. Every connection. Live.
The pipeline graph is the identity screen of Audiogravity. It renders your
audio-topology.json — the physical and
virtual map of your Hi-Fi chain — as a live, interactive SVG you can pan, zoom and steer from. Click any
link to open the steering popover and reroute ALSA output without interrupting playback.
IdleActive streamBit-perfect
Real-time scheduling · Pro
End the jitter.
A 200 µs interrupt is enough to make a DSD256 stream audibly grainy.
Audiogravity
configures the kernel scheduling parameters of every audio service through systemd drop-ins — never
touching the original unit files. Upgrade-safe. Reversible. Verifiable with cyclictest.
What you control, per service
PolicySCHED_FIFO (strict) or SCHED_RR (round-robin RT)
Priority1 → 99. MPD at FIFO/80, AirPlay at FIFO/60,
workers below.
AffinityPin each service to one or more dedicated cores,
isolated from the rest of the system.
MEMLOCKLock memory pages in RAM — no swap during
playback.
RTPRIOCap RT priority for internal threads of the
process.
GovernorPerformance on audio cores, powersave on idle cores,
re-applied at boot.
# /etc/systemd/system/mpd.service.d/audio.conf
# written by Audiogravity · upgrade-safe drop-in
[Service]
CPUSchedulingPolicy=fifo
CPUSchedulingPriority=80
CPUAffinity=2 3
LimitMEMLOCK=infinity
LimitRTPRIO=95
Nice=-19
# verified by cyclictest
# max latency 47 µs · ✓ bit-perfect
2s
SSE telemetry, peak
Live CPU, temperature, I/O and network streamed to every connected browser. Backs off to 30 s at
idle.
47µs
Cyclictest max latency
On a tuned Pi 5 with FIFO/80, CPU pinning and MEMLOCK — measured from the browser, archived with
timestamp.
0
Cloud dependencies
Everything runs on your local machine. No account. No telemetry. Your music metadata, credentials
and system state stay on your network.
Where it sits
Five layers. Audiogravity covers three.
A streaming system is a stack. Audiogravity does not compete with audio engines like MPD, Roon Bridge or HQPlayer — it sits above them.
5
User Interface
Browser · phone · tablet · PWA
Audiogravity
4
Control / Orchestration
Source switching · transport · volume · monitoring
Audiogravity
3
Content Sources
NAS · Qobuz · Tidal · MinimServer · upmpdcli
2
Audio Engine
MPD · Roon Bridge · HQPlayer NAA · AirPlay
1
OS / Kernel
RT scheduling · CPU pinning · IRQs · ALSA
Audiogravity tunes it
The takeaway: Audiogravity orchestrates the audio engines that audiophiles already trust (Roon, MPD, HQPlayer, AirPlay, UPnP) and adds kernel-level tuning on top — without replacing or hiding any of them.
How it compares
One orchestrator. Every audiophile engine.
Audiogravity sits at a different layer than the rest. It does not compete with Roon, MPD or HQPlayer — it orchestrates them. The table below clarifies where each solution stops.
✓ supported · partial = limited · — not available. Comparison based on public information from each vendor's documentation as of 2026.
Mobile · PWA · WebAuthn
An app on your phone. Without an app store.
Audiogravity isn't just a web interface — it's a Progressive Web App,
installable
from Safari or Chrome to your home screen. Full-screen, dedicated icon, biometric login, push
notifications when a service falls over.
Install in one gesture. Unlock with your face.
From Safari (iOS) or Chrome (Android), add Audiogravity to your home screen. The app
opens
full-screen, without browser chrome, with its own icon. After a first password login, register a
passkey on the device — every subsequent login is Face ID, Touch ID, fingerprint or YubiKey.
InstallSafari / Chrome → Add to Home Screen →
full-screen PWA
LoginFace ID, Touch ID, Android fingerprint,
Windows Hello, YubiKey
Multi-deviceSeveral passkeys per user, managed
one-by-one in your profile
PushNotification when a service fails,
temperature crosses threshold, critical event — even with the app closed
Audiogravity ships in three tiers: a 30-day Trial with full access, a free
Starter
Edition that activates automatically when the trial ends, and a Pro License — a lifetime license that
permanently unlocks all features on one machine.
Trial
€0
30 days · auto-activated
Full access to every feature on first install. No action required. Days remaining
shown in Admin › License.
Permanently unlocks every Pro feature. Bound to one installation. Includes all
v1.x updates. Pro holders get a preferential upgrade price for new major versions.
Linux Debian or DietPi on x86_64 and Raspberry Pi (aarch64). Other distributions
may work but are not officially supported. License is bound to the machine — moving to a new device
requires a license reset, available on request.
01Pay with PayPalClick "Pay with PayPal" in Admin › License. €49 lifetime.
02Receive your keyLicense key delivered by email within seconds. Order code unique to you.
03Activate this machineClick "License Key", enter the key, confirm. The signed .lic file is bound to your
device.
04ListenAll features immediately available. No restart, no logout. No subscription.
FAQ
Common questions.
The Starter Edition activates automatically — no action required.
You keep full access to all Starter features indefinitely, for free. Pro features are locked
until you purchase a license.
Yes. MPD alone is enough for the Starter Edition. Roon, HQPlayer,
upmpdcli, Shairport-Sync and AirPlay are all optional — Audiogravity manages
whichever services are installed on your machine.
Only if you want to use those services. Qobuz and Tidal browsing in
the Library requires an active subscription to each respective service. Everything else
works without any third-party subscription.
Audio playback runs entirely on your local network — no cloud, no
telemetry. However, license activation and periodic validation require access to the license
server. Qobuz and Tidal also require an active internet connection for streaming.
No. A Pro license is bound to one installation. If you move to a new
machine, a license reset is available on request — contact us at audiogravity@di-marco.net.
All v1.x updates are included with the Pro license. Pro holders
receive a preferential upgrade price for future major versions.
Installation
On your streamer in one command.
No compilation, no dependency hell, no manual configuration. The installer
detects your architecture, generates security keys, configures the systemd service and starts
everything. Under five minutes from curl to listening.
RecommendedDietPi on x86_64 or Raspberry Pi (aarch64)
SupportedDebian / Ubuntu — any recent kernel
AccessAny browser on your network — phone, tablet,
laptop
NetworkLocal only. Your data never leaves your home.
Trial30 days full access · auto-activated on first run
DietPi
Recommended
Raspberry Pi
aarch64
Debian / Ubuntu
x86_64
# All-in-one (backend + frontend on the same host)curl-fsSLhttps://audiogravity.app/install.sh \ | sudo bash -s -- --token ghp_xxx# Then open in your browser:https://<ip-of-your-streamer>
# Or install separately on different hosts:curl-fsSLhttps://audiogravity.app/install-backend.sh \ | sudo bash -s -- --token ghp_xxxcurl-fsSLhttps://audiogravity.app/install-frontend.sh \ | sudo bash -s -- --token ghp_xxx# Then open in your browser:https://<ip-of-your-streamer-frontend>
