SonusQuest vs FixYourDeck

SonusQuest: Turn your phone into a real-time in-ear monitor — it captures the sound around you, removes noise, boosts your voice, and plays it back through your earphones so you can hear yourself while live streaming. It can be used to practice pronunciation, reading aloud, singing, aiding memorization, DAF (Delayed Auditory Feedback) therapy for stuttering, and more. Some users with hearing loss use it as a hearing aid; we suggest such users treat this app as an introduction to hearing aids rather than a replacement for one. 1. Supports both wired earphones and Bluetooth earphones 2. Supports the phone's built-in microphone, wired earphone microphones, and lavalier (clip-on) microphones 3. Hearing protection: automatically lowers output power when a sudden loud sound is detected 4. Long-duration loop recording, with recordings automatically split into multiple files of a fixed length 5. Audio noise reduction based on traditional signal-processing algorithms — simple and practical, effectively filtering steady background noise 6. AI-powered intelligent noise reduction that efficiently filters irregular background noise, such as the clatter of keyboard typing, footsteps, knocking, the hum of robot vacuum cleaners, and more 7. On-demand audio delay control: supports delay settings from 1 to 30 seconds, as well as millisecond-level delay settings to help friends correcting stuttering 8. Automatic gain control, making sound steadier and easier to understand 9. 10-band audio equalizer so users can customize their preferred tone. A default EQ preset for speech is built in and can be reset with one tap

FixYourDeck turns your iPhone and a class-compliant USB audio interface into a complete measurement bench for cassette decks — the instruments a service workshop used to need a rack for. MEASURE • Frequency response 20 Hz – 20 kHz, both channels, with -3 dB bandwidth and chain-baseline subtraction • Wow & flutter to IEC 386 / DIN 45507 (weighted peak, weighted and unweighted RMS, wow/flutter split) with a flutter spectrum that names the worn rotating part • Speed error and long-term speed drift • Noise and signal-to-noise (flat, A-weighted, CCIR-468), MOL and SOL, dynamic range • Azimuth with live level, phase and inter-channel timing meters — set the azimuth of discrete heads with ease, using the special azimuth test tape or any well-recorded prerecorded tape • Diagnostics: modulation noise, crosstalk, erase efficiency, dropout counter ALIGN Guided assistants for bias (over-bias from the 10 kHz peak), record level / Dolby level, azimuth and playback alignment with a calibration tape — live meters you can turn a screwdriver against. TEST ANY DECK, EVEN A WALKMAN Record the self-describing Measurement Test Tape once on a good deck; each segment announces itself with a digital marker. Play it on any two-head deck or portable and the app grades frequency response, wow & flutter, speed drift and azimuth from playback alone — no monitoring head needed. DOCUMENT Every deck is a profile with its own calibration and saved sessions. Compare before and after service, and export one PDF — the Deck Measurement Protocol — with every value tabulated. TOOLS Oscilloscope (Y-T and Lissajous), tone generator, real-time 1/3-octave analyzer, level meters. WHAT YOU NEED A class-compliant USB audio interface with a stereo line input and output (e.g. a 2-in/2-out interface), cables to the deck's line in/out, and a blank tape. The speed check works with the built-in microphone alone. FREE AND PRO Speed and frequency measurement are free. FixYourDeck Pro — a one-time purchase, no subscription — unlocks all other measurements, the alignment assistants, diagnostics and protocol export. Made by cassette-deck restorers, in 16 languages. No account, no analytics, no data collection: everything stays on your device.