K7D vs Velvet Machine
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
K7D
This app offers a vintage tape delay effect with analog emulation and modern controls. It recreates classic hardware echo machines for a warm, characterful sound. Use it standalone or as an AUv3 plugin in iOS DAWs.
- Analog modeled dual playhead delay
- Modeled microphone input with saturation
- Normal and Ping Pong modes
- High pass and Low pass feedback filters
- Powerful LFO time modulation
- BPM syncable delay time
- MIDI delay time modulation
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K7D is a powerful and affordable, vintage tape delay effect plugin for iOS. K7D recreates the hardware echo machines of the past using Imaginando’s signature style of obsessive analog emulation, but with an enhanced level of control from a sleek, modern interface. Using this approach allows a whole new world of creative possibilities, while still retaining a warm, full-bodied analog sound, bursting with character and personality. To give K7D it’s distinctive analog flavour, we studied and analysed the tiny details of what makes classic hardware delays great, and painstakingly recreated every subtle nuance for a fantastically authentic sound. Available as a standalone app and audio unit plugin, you can use it digital audio stations for iOS such as Garage Band, AUM, Cubasis, Auria, Audiobus, etc. Features - 1ms to 1 sec. dual playhead analog modeled delay with noise, tape distortion and mechanical vibration models - Modeled microphone input with pre-amp saturation - Normal and Ping Pong modes - Optimized gain staging and saturation algorithms for very musical results - Delay time spread between heads and stereo width control - High pass and Low pass filter on feedback path - Powerful LFO bipolar time modulation with multiple waveforms (sine, triangular, saw, square, sample and hold and filtered sample and hold) and possibility of inverted LFO phase on second play head (for added stereo imaging) - Delay time syncable with BPM - Possibility of delay time modulation via incoming midi notes - Oscilloscope visualisation of audio waveform and LFO waveform - Built-in patch manager - Audiounit compatible
Velvet Machine
This audio effect plugin generates unique sonic textures by blurring and stretching sounds. It can create reverb-like qualities, act as a delay, and offers extensive control over its volume envelope and timing. Requires a compatible host app and a relatively modern device for optimal performance.
- Real-time convolution with enveloped velvet noise
- Sound stretching and blurring up to 10 seconds
- Reverb-like textures with flexible volume envelope
- Variable density random multi-tap delay
- Host tempo sync for time and predelay
- High cut and low cut filters
- Adjustable dry/wet mix
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Sonic texture generator / blur / non-linear reverb *** WARNING *** Velvet Machine is an Audio Unit v3 plugin and requires a compatible host such as GarageBand, AUM, Cubasis, Audiobus etc. The provided standalone app does NOT support the currently deprecated Inter-App Audio. *** Velvet Machine is a CPU-intensive effect at high settings. A *minimum* of 5th Gen iPad, iPhone 6s or 1st Gen iPhone SE is required to run a single instance at maximum settings. However, shorter times and/or lower densities use much less CPU. *** Velvet Machine is a unique audio effect based on real-time convolution with enveloped velvet noise. It's designed to: - Stretch and blur out even short sounds to lengths of up to 10 seconds - Produce reverb-like textures with flexible volume envelope (including reverse, fading in and out, pulsating etc.) - Work as a variable density random multi-tap delay (bordering on granular-like sounds) PDF manual and video demos are available on developer website. Features: - Flexible volume envelope with arbitrary number of segments and curvature - Effect time ranging from 50 ms to 10 s - Response density adjustable from 1 to 2000 repeats per second - Predelay up to 1 s - Host tempo sync for time and predelay parameters - High cut and low cut filters for the effected signal - Mix adjustable from 100% dry to 100% wet - Mix Lock to switch presets while keeping the dry/wet mix constant
Screenshots
Verdict
The clearest difference is review sentiment: Velvet Machine at 100% against K7D's 80%. Velvet Machine also leads on rating (4.9 vs 4.6) and iOS requirement (12.0 vs 17.0). K7D's advantage is price ($3.99 vs $7.99). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
K7D costs $3.99 and Velvet Machine $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Velvet Machine holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 79 and 47 respectively. Written reviews point the same way: 80% of K7D's written reviews are positive against 100% of Velvet Machine's.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 11, 2026 and November 7, 2026 respectively.
| Parameter | K7D | Velvet Machine |
|---|---|---|
| Price | $3.99 — better | $7.99 |
| Rating | 4.6 (79 ratings) | 4.9 (47 ratings) — better |
| Positive reviews | 80.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 79 — better | 47 |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 114 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Imaginando Lda | Yuri Turov |
Customer experience
K7D
Velvet Machine
Bugs and requests
K7D
Reported bugs
8 issues- App crashing with many instruments
- Project crashes and data loss
- App not opening after crashes
- App deleting progress
- Randomiser not working
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- App will not load
- Digital pops and clicks with Audiobus 3
- Dry signal only in one ear with stereo input
Requested features
9 requests- Fix background audio standalone
- Fix randomiser feature
- Improve CPU efficiency
- Make iPad and iPhone versions compatible
- Add reverse playback option
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- Allow MIDI assignment for knobs/functions
- Improve input selection for interfaces
- Update for Audiobus 3 compatibility
- Make UI elements larger and more visible
Velvet Machine
Not enough reviews yet to summarise bugs or requests.
In-app purchases
K7D
No in-app purchases
Velvet Machine
No in-app purchases








