# pOus — DSP emulation of BassDrum

> AUv3 instrument emulating analog bass drums with MIDI out and scale mode. (iPhone/iPad app by Satoshi Kajii.)

- Source: https://appshunter.io/ios/app/pous/id6748279554 (this page in markdown: same URL + `.md`)
- Developer: [Satoshi Kajii](https://appshunter.io/developer/1777441634)
- Category: Music
- Price: $2.99 (on sale, was $4.99)
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 12.0 · 15 MB
- Released: 2025-07-08
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/pous/id6748279554/reviews.md

## What is pOus?

Concept:

The app is an AUv3 instrument that emulates the so-called “BassDrum” of analog drum machine. In addition it features MIDI OUT functionality of Envelop Follower, that is, the user can send out this instrument's unique envelop via midi CC for modulating external plugins. Also there is "scale mode" where the user can play "pOus" with musical scale like Bass.

System Requirements:

AUv3 host that has a flexible capability of MIDI routing (AUM, apeMatrix, etc)

Usage:

There are 9 sliders & one button.

Tune: BassDrum’s fundamental frequency (30hz - 160hz). text-editable.
Decay: determines its duration. 
Amp: audio’s decibel representation. 
MIDI OUT: whether the functionality of envelop follower is turned on or off (default: off)
MIDI Gain: gain amount of MIDI out
Offset: balances the output parameter’s value
Channel: determines MIDI channel
MIDI CC: determines the destination MIDI CC number. text-editable
Scale Mode: This is a sort of Bass mode, that is, it can play musical scale in response to incoming MIDI notes.
Button: triggers the instrument.

Recommended Scheme:

drum machine (MIDI out) -> “pOus” -> audio effect (compressor, saturator etc)

## Key features

- BassDrum emulation
- Adjustable tune and decay
- MIDI OUT envelope follower
- Scale mode for musical notes
- AUv3 instrument
- MIDI CC routing


## Frequently asked questions about pOus

### What is pOus?

pOus is an AUv3 instrument that emulates the bass drum sound of analog drum machines. It allows users to adjust tuning, decay, and amplitude, and offers MIDI OUT functionality for its envelope follower.

### What are the system requirements for pOus?

pOus requires an AUv3 host with flexible MIDI routing capabilities, such as AUM or apeMatrix. It is compatible with iPhone, iPad, and iPod.

### Can pOus be used to control other plugins?

Yes, pOus features MIDI OUT functionality for its envelope follower. This allows you to send the instrument's unique envelope via MIDI CC to modulate external plugins.

### What is 'Scale Mode' in pOus?

Scale Mode in pOus allows you to play the instrument using a musical scale in response to incoming MIDI notes, similar to playing a bass instrument.

### How much does pOus cost?

pOus is a paid application priced at $4.99. It does not feature in-app purchases or advertisements.

### How often is pOus updated?

pOus was last updated on November 11, 2025, to version 1.0.1. Further update frequency is not specified but indicates ongoing development.

### What is the age rating for pOus?

pOus has an age rating of 4+, making it suitable for a wide range of users interested in music production.

### Does pOus have ads?

No, pOus does not contain advertisements. It is a paid application designed for a focused user experience.

## Version history (last 2 releases)

### 1.0.1 — 2025-11-11

A new functionality added: "scale mode". This is a sort of Bass mode, that is, it can play musical scale in response to incoming MIDI notes. (default: OFF)

### 1.0 — 2025-07-08

No release notes.

## Apps similar to pOus

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Spectrum AUv3 FFT Visualizer](https://appshunter.io/ios/app/spectrum-auv3-fft-visualizer/id6737164438) | — | $0.99 | Music |
| [NovaLimit - Spatial Limiter](https://appshunter.io/ios/app/novalimit-spatial-limiter/id6752733727) | 5.0 (2) | $9.99 | Music |
| [GSDSP MagicFilter](https://appshunter.io/ios/app/gsdsp-magicfilter/id6670615154) | 5.0 (3) | $29.99 | Music |
| [midifruuze](https://appshunter.io/ios/app/midifruuze/id6504027734) | 4.6 (7) | $3.99 | Music |
| [Visual Reverb AUv3 Plugin](https://appshunter.io/ios/app/visual-reverb-auv3-plugin/id1472169417) | 5.0 (1) | $7.99 | Music |
| [mididelay](https://appshunter.io/ios/app/mididelay/id6505042226) | 5.0 (3) | $4.99 | Music |

## More apps by Satoshi Kajii

- [StereoLoco](https://appshunter.io/ios/app/stereoloco/id6737751583)
- [shortReverse](https://appshunter.io/ios/app/shortreverse/id6738296410)
- [Jacquardi](https://appshunter.io/ios/app/jacquardi/id6738633198)
- [DeDrummer](https://appshunter.io/ios/app/dedrummer/id6744193942)
- [pitchBender](https://appshunter.io/ios/app/pitchbender/id6744398563)
- [DeHiss](https://appshunter.io/ios/app/dehiss/id6744572519)

All apps by Satoshi Kajii: https://appshunter.io/developer/1777441634

---

*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.*