Add minimal JACK host for real-time effect testing (fixes #31)

[NickFlach]

Addresses issue #31 - JACK host for testing without hardware.

Adds a minimal JACK audio host that allows testing AudioNoise effects in real-time without the RP2354 hardware.

Features:

• Connects to JACK audio server
• Applies any effect in real-time
• Simple command-line interface matching existing convert tool

Build:
\\�ash

Requires libjack-dev

sudo apt install libjack-dev # Debian/Ubuntu
make jack_host
\\

Usage:
\\�ash

Start JACK server first (e.g., via qjackctl or jackd)

Run effect

./jack_host flanger 0.6 0.6 0.6 0.6

Connect ports

jack_connect system:capture_1 audionoise:input
jack_connect audionoise:output system:playback_1
\\

Implementation:

• ~180 lines of C
• Uses same effect headers as convert.c
• Single input/output mono channel
• Warns if sample rate != 48kHz
• Clean shutdown on Ctrl+C

This lowers the barrier for Linux users to experiment with effects using just a sound card.

Signed-off-by: The Hand [email protected]