# Multimode Ladder Filter — 5 modes - LP/HP/BP/Notch/Res

> Classic 4-pole ladder filter emulation with five modes and analog-style distortion. (iPhone/iPad app by Callback Audio, LLC.)

- Source: https://appshunter.io/ios/app/multimode-ladder-filter/id6769653852 (this page in markdown: same URL + `.md`)
- Developer: [Callback Audio, LLC](https://appshunter.io/developer/1896220942)
- Category: Music
- Price: $1.99
- Rating: 5.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 17.0 · 7 MB
- Released: 2026-05-19
- Data updated: 2026-09-06
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/multimode-ladder-filter/id6769653852/reviews.md

## What is Multimode Ladder Filter?

A 4-pole (24 dB/oct) ladder filter modeled after the topology designed by Robert Moog in 1965. Four cascaded one-pole stages with tanh saturation at input and feedback produce warm analog-style distortion that scales with drive and resonance.

Five filter modes (lowpass, highpass, bandpass, notch, and resonant) cover everything from classic subtractive sweeps to sharp self-oscillating leads. Resonance drives the filter to self-oscillation at high values, generating a sine tone at the cutoff frequency. A dry/wet control enables parallel filtering.

## Key features

- 4-pole ladder filter emulation
- Five filter modes (LP, HP, BP, Notch, Resonant)
- Analog-style distortion with drive
- Self-oscillation at high resonance
- Dry/wet parallel filtering control


## Frequently asked questions about Multimode Ladder Filter

### What is Multimode Ladder Filter based on?

Multimode Ladder Filter is modeled after the 4-pole (24 dB/oct) ladder filter topology originally designed by Robert Moog in 1965. It aims to replicate the warm analog sound of that classic design.

### What filter modes does Multimode Ladder Filter offer?

Multimode Ladder Filter provides five distinct filter modes: lowpass, highpass, bandpass, notch, and resonant. This allows for a wide range of sound shaping possibilities, from classic subtractive sweeps to sharp leads.

### Can Multimode Ladder Filter create distortion?

Yes, the app features tanh saturation at the input and feedback stages, producing warm analog-style distortion. This distortion scales with the drive and resonance settings, allowing for dynamic tonal shaping.

### What happens when resonance is high in Multimode Ladder Filter?

At high values, the resonance setting drives the filter into self-oscillation. This generates a sine tone at the cutoff frequency, adding a unique sonic character to the processed audio.

### Does Multimode Ladder Filter have ads?

No, Multimode Ladder Filter does not contain advertisements. As a paid application, it offers an uninterrupted user experience.

### What devices is Multimode Ladder Filter compatible with?

Multimode Ladder Filter is available for both iPhone and iPad. It is designed to run on iOS devices.

### How often is Multimode Ladder Filter updated?

The latest version of Multimode Ladder Filter is 1.1.2, which was released on June 6, 2026. The app was initially released on May 19, 2026, indicating a recent update.

### What is the price of Multimode Ladder Filter?

Multimode Ladder Filter is available for a one-time purchase of $1.99. There are no in-app purchases or subscription fees associated with the app.

## Version history (last 4 releases)

### 1.1.2 — 2026-06-06

- Metadata and labelling updates

### 1.1.1 — 2026-05-26

- Bug fix for smoothing while changing params

### 1.1 — 2026-05-22

- UI padding fixes
- App Store preview added

### 1.0 — 2026-05-19

No release notes.

## More apps by Callback Audio, LLC

- [Raw Byte Audio Machine](https://appshunter.io/ios/app/raw-byte-audio-machine/id6766166760)
- [Bit Crusher](https://appshunter.io/ios/app/bit-crusher/id6770401698)
- [Wavefolder](https://appshunter.io/ios/app/wavefolder/id6772079543)
- [Callback Freeverb](https://appshunter.io/ios/app/callback-freeverb/id6775060495)
- [Delay Line](https://appshunter.io/ios/app/delay-line/id6776276739)

All apps by Callback Audio, LLC: https://appshunter.io/developer/1896220942

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*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 2026-09-06.*