# Coastline - Audio Effect — Instant atmosphere generator > Dual-engine audio sustainer for music texture and atmosphere generation. (iPhone/iPad app by Aqeel Aadam.) - Source: https://appshunter.io/ios/app/coastline-audio-effect/id6780281953 (this page in markdown: same URL + `.md`) - Developer: [Aqeel Aadam](https://appshunter.io/developer/1724235864) - Category: Music - Price: $14.99 - Rating: 5.00/5 from 10 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 71 MB - Released: 2026-06-25 - Data updated: 2026-08-24 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/coastline-audio-effect/id6780281953/reviews.md ## What is Coastline? Atmosphere machine. Texture generator. Harmonic workstation. A dual-engine audio sustainer with intermodulation, advanced filtering, support for custom samples, and more – all in the service of adding depth and character to your music. Coastline uses a combination of additive and granular synthesis to stretch sounds infinitely. It creates complementary ambience for any sound or composition. It brings a textural “je ne sais quoi” that makes your tracks stand out and feel more alive. Move as quickly as you want: slap it on a track for instant atmosphere, or use it as the recording and processing hub of entire compositions. All recordings happen immediately and automatically – set one volume threshold, and sit back. ENGINES AND EFFECTS • Tide – an additive synthesizer for reimagining sound. Control which frequencies of the input are mapped to oscillators, rebalance them to highlight harmonic or inharmonic characteristics, and introduce new frequencies with waveshaping. • Glade – a granular synthesizer that stretches sound forever with no clicks or transients. Balance the original timbre of your sound against Tide’s distillation of it. • Audio Matrix – route any channel in Coastline to intermodulate another. Create unique harmonic distortions, or load samples to introduce a completely new texture. Includes built-in field samples for naturalistic textures. • Filter – a multi-mode filter for all audio in Coastline, featuring feedback modulation, stereo spread, and independent per-channel controls. • Reverb – a downsampling reverb with a highly configurable chorus section for blending the results of Coastline and introducing another layer of texture and modulation. FEATURES • Modulation – modify any control in Coastline with multiple LFOs, sequencers, smooth random sources, and performance effects. • Presets – full preset control over every parameter in Coastline. Cross-platform preset format for sharing with friends. • Waymaker – connect to Coastline’s sibling application, Waymaker, for sequencing and additional control over the pitch of Coastline’s output. Includes 20+ presets by Peter Bark and imago meri. Also available for macOS and Windows in VST3 / AU / AAX formats from Aqeel Aadam Sound. ## Key features - Dual-engine audio sustainer - Additive and granular synthesis - Custom sample support - Intermodulation and advanced filtering - Extensive modulation options - Cross-platform preset sharing ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/coastline-audio-effect/id6780281953/reviews.md ### 5/5 — Lovely behind Guitar *2026-07-03* This app makes really lovely, evolving drones that live very well behind solo lines and riffs. The modulation options make it really special for me: I can set it up so it only opens up for input at the beginning of a measure; so I can hit a chord, then noodle around with solos and licks over the top of it. Or I can just leave the input open at a particular threshold and let the app take in the louder bits while I’m playing and so they jangle together in new and interesting ways. And then set up an envelope to swell into the sound as the input goes quiet. And on and on. I also just love this dev’s background designs - they offer a really beautiful representation of what the app is doing to your sound. I’ll be playing around with this one for a long time. ## Frequently asked questions about Coastline ### What is Coastline? Coastline is an audio effect application designed to generate unique atmospheres and textures for music. It utilizes a dual-engine sustainer with advanced synthesis and filtering capabilities to enhance musical compositions. ### What kind of synthesis does Coastline use? Coastline employs both additive and granular synthesis. The 'Tide' engine uses additive synthesis to reimagine sound frequencies, while the 'Glade' engine uses granular synthesis to stretch sounds infinitely without clicks. ### Can I use my own samples with Coastline? Yes, Coastline supports custom samples. You can load your own samples into the 'Audio Matrix' to introduce entirely new textures and intermodulate them with other audio channels. ### How does Coastline handle modulation? Coastline offers extensive modulation capabilities. You can modify any control using multiple LFOs, sequencers, smooth random sources, and performance effects to create dynamic and evolving sounds. ### Is Coastline available on multiple platforms? The application is available for iPhone, iPad, and iPod. Desktop versions for macOS and Windows are also available in VST3, AU, and AAX formats. ### How much does Coastline cost? Coastline is a paid application, priced at $11.99. This one-time purchase grants you full access to all of its features. ### Does Coastline have ads? No, Coastline is ad-free. As a paid application, it does not contain any advertisements, allowing for an uninterrupted creative workflow. ### How often is Coastline updated? Coastline was last updated on June 26, 2026, with version 1.0.1. While specific update frequency isn't detailed, this indicates ongoing support and development from the developer. ## Version history (last 4 releases) ### 1.0.3 — 2026-08-20 - Now includes 20+ presets by Peter Bark and imago meri - Added buttons in the Settings menu for MIDI learning transport controls (play/pause/record/clear) - Fixed some visual glitches - Exact values can be typed in for all knobs/sliders by right clicking ### 1.0.2 — 2026-07-27 - Added an option to include a dry/wet slider by default. - Added the ability to lock the input volume when loading presets. - Fixed crashes with reloading projects that include audio. - Modulation sources can now be dragged directly to other modulation amounts, to modulate them. - Fixed Audio Matrix samples not playing until a Sustainer starts. - Improved efficiency of graphics rendering. - Fixed some graphics issues with animations. - Added some parameters for automation ("learn") ### 1.0.1 — 2026-06-26 Day one maintenance update. Fixes some issues with modulation assignments and audio quality that surfaced during initial app review. ### 1.0 — 2026-06-25 No release notes. ## More apps by Aqeel Aadam - [Weeping Wall](https://appshunter.io/ios/app/weeping-wall/id6475484795) - [Ridgewalk](https://appshunter.io/ios/app/ridgewalk/id6502917859) - [Waymaker - Modular Sequencer](https://appshunter.io/ios/app/waymaker-modular-sequencer/id6737984216) - [Outgrowth - Sample Instrument](https://appshunter.io/ios/app/outgrowth-sample-instrument/id6755965753) All apps by Aqeel Aadam: https://appshunter.io/developer/1724235864 ## Related topics [coastline](https://appshunter.io/ios/topics/coastline) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*