ERS_250 vs StajPilot
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ERS_250
This audio plugin faithfully replicates the EMT 250, the first digital hardware reverb ever made. It offers adjustable decay time, frequency response, predelay, and a dry-wet ratio, with an optional modern schematic.
- Replication of original EMT 250 schematics
- Adjustable reverb decay time (0.4-5s)
- Adjustable low and high frequency response
- Adjustable predelay
- Additional low-pass filter
- Adjustable Dry-Wet ratio
- Optional 'modern' schematics
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The ERS 250 reverb audio plugin was originally designed and sold by Harrie Munnik and his Dutch company EmptyRoomSystems. DDMF, having been a part in the development of the first version some years ago, is proud to carry on the legacy by distributing and further developing the set of ERS plugins. This unit is a faithful replication of the first digital hardware reverb ever made, the EMT 250. Only 250 units of that legendary studio tool have ever been produced… needless to say, the availability as an audio plugin has received an enthusiastic welcome by the audio engineering and production community. Now this plugin is finally available for compatible iOS hosts that support either AUv3 or InterAppAudio. Features: - Careful reproduction of the original schematics - Adjustable reverb decay time (from 0.4 to 5 seconds), low frequency response, high frequency response, and predelay - Additional low-pass filter to create darker sounds - Dry-Wet ratio adjustable - Alternative “modern” schematics available
StajPilot
Control and edit your KEMPER PROFILER with two distinct modes: STAJ for performance display and effect switching, and PILOT for in-depth parameter adjustments. Organize songs, manage amp images, and utilize custom tunings for a streamlined musical workflow.
- Performance display with rig and effect names
- Touch controls for switching rigs and effects
- Song organization with multilingual support
- Detailed parameter editing for effects and RIG settings
- Customizable tuning profiles
- Tap tempo and direct tempo entry
- Bluetooth MIDI foot-controller support
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StajPilot brings two connected workflows to your KEMPER PROFILER: STAJ mode for performance and PILOT mode for editing. It is not just for Player. Supported device profiles include PROFILER Player and MK1/MK2 models such as Stage, Head/Toaster and Rack, with available controls adapted to your hardware and Player level. STAJ MODE: YOUR PERFORMANCE DISPLAY AND CONTROLLER See rig names, effect names and on/off states, bank/slot positions, amplifier information, gain, tempo and pedal Morph status in a clear landscape interface. Switch rigs and supported effects with touch controls. View Effect I-IV assignments and Player FX1/FX2 assignments on the corresponding effect blocks where supported. SONG MODE AND SONG EDITING Organize your own song names, slot labels and sub-labels with multilingual text and emoji support. Song Mode works with Player banks and the Performance slots of supported larger PROFILER models. Quickly choose a song from Song Select, or long-press a song to edit it directly. Manage amp-image assignments alongside your song data. Import and export local Song data, and use the companion web Song Editor to prepare and edit songs on a larger screen. Song labels are managed by StajPilot; they do not rename rigs stored on your PROFILER. NEW IN STAGE 2: PILOT MODE Select an effect block, change its effect type and supported preset, and adjust detailed parameters using knobs, switches, selection lists, a focused slider and direct numeric entry where available. Edit supported RIG, INPUT, AMP, CABINET, OUTPUT and Fixed FX settings in the same workspace. Related controls are grouped visually. Controls and effect availability follow the selected device and Player level. PILOT mode is unavailable in Browser mode on MK1/MK2. CUSTOM TUNING Use Standard tuning or three editable Custom Tuner profiles with individual E-A-D-G-B-E offsets from -15.0 to +15.0 cents. Rename your profiles and choose the one you need. Custom offsets apply to needle mode, with the standard note/cents reference available for comparison. Needle, decimal needle and strobe displays are available, along with a full-screen tuner option. MORE CONTROL Tap tempo, direct tempo entry, configurable bank limits, amp images and in-app information panels support everyday use. Optional Bluetooth MIDI foot-controller support currently targets the M-VAVE Chocolate controller only; it is separate from the wired PROFILER connection. A reserved app MIDI channel can keep app-specific commands from being forwarded to the PROFILER. BEFORE USING PILOT MODE Select the correct device type and Player level in Settings. To keep changes permanently, press STORE on the KEMPER itself. Calibration has been extensively checked and verification continues, but some displayed values may differ from the hardware. Read the in-app PILOT notice before editing. Synchronization combines incoming MIDI data with targeted requests to limit unnecessary traffic; it is not completely bidirectional, so avoid simultaneous editing on the PROFILER while using PILOT mode. CONNECTION AND COMPATIBILITY A compatible KEMPER PROFILER and a reliable USB MIDI data connection are required for hardware control. Supported functions vary by model, firmware and Player level. The app does not intercept proprietary non-MIDI communication. Core USB functions require no account or subscription. Demo mode lets you explore the interface without hardware. Test your complete setup before an important performance. Hardware, firmware and operating-system changes may affect compatibility. StajPilot is an independent third-party app, not affiliated with or endorsed by Kemper GmbH. KEMPER and PROFILER are trademarks of Kemper GmbH.
Screenshots
Verdict
The clearest difference is price: ERS_250 at $13.99 against StajPilot's $29.99. ERS_250 also leads on iOS requirement (9.3 vs 15.0). StajPilot's advantage is update cadence (every 4 days vs every 8 months). On review sentiment, ads, in-app purchases and monetization model 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
ERS_250 costs $13.99 and StajPilot $29.99 up front. Neither carries in-app purchases, so what you see is what you pay.
ERS_250 ships an update every 8 months, StajPilot every 4 days. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.
| Parameter | ERS_250 | StajPilot |
|---|---|---|
| Price | $13.99 — better | $29.99 |
| Rating | 4.3 (6 ratings) — better | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 6 — better | — |
| Update frequency | Every 8 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.3 — better | 15.0 |
| Further details — not scored | ||
| Size | 9 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Christian Siedschlag | JONGWOONG AN |
Customer experience
ERS_250
StajPilot
In-app purchases
ERS_250
No in-app purchases
StajPilot
No in-app purchases









