Hammer Klavier

Boutique upright + real metal hammers for one-of-a-kind piano sound.


80 in stock

Completely Unique Sound
Instantly Inspiring
Stackable Hammer Voices
World-Class Support
Earn Loyalty Points
Easy-to-Use Interface

Audio Demos

  1. Prelude Henning Nugel 0:54
  2. Maple Leaf Rag Scott Joplin (mock-up by Andrew Aversa) 2:43
  3. Raining Stars (Dressed) Steven Cravis 3:08
  4. Moonlight Sunset Matias Dapena (mixed by Titanio) 1:21
  5. Sole - In This World of Mine Nabeel Ansari 0:45
  6. Shady Saloon Michael Hoffman 1:46
  7. Gemütlichkeit Fredrik Häthén 0:46
  8. Prelude (Full Version) Henning Nugel 1:23
  9. Daggers of Sitar Matias Dapena (mixed by Titanio) 1:18
  10. Into The Oort Cloud Infinity Tone 1:28
  11. Raining Stars (Naked) Steven Cravis 3:00


What happens if you replace an upright piano’s felt hammers with real metal-tipped hammers? Hammer Klavier is an avant-garde instrument with a new sound, the dynamic responsiveness of a regular piano, and much greater versatility than the typical prepared piano. Created in partnership with YouTuber and musical mad scientist Mattias Krantz.

Product Info

One-of-a-kind prepared upright piano

Every hammer replaced with real, actual metal hammers, creating a beautiful and strong tone.

Double or triple voice stacking

Create a larger-than-life piano sound by stacking voices with a single click. Adjust tuning, stereo width, and unison volume easily.

Pristine 24-bit recordings

Captured with 2 distinct stereo mic positions for excellent detail, space, and air.

Exquisite detail

Six dynamic layers, chromatic sampling (every key recorded individually), 2x general round robins, 5x release RRs.

20 production-ready snapshots

Suitable for soundtrack music, pop, rock, ambient, and everything in between.

Komplete Kontrol Keyboard


Streamlined, modern UI
Adjust key, voice, and noise behavior
Customizable dynamic response and 'touch'
Extra sound design controls
CONSOLE FX rack and mixer with dozens of modules


System Requirements
7GB disk space

7200 RPM hard drive or solid state drive recommended

4GB of RAM

Higher amounts of memory let you load more instruments.

KONTAKT Player 6.6+

This library will run in the FREE Kontakt Player.

Kontakt Requirements - Mac OS

Intel Macs (i5 or higher): macOS 10.14, 10.15, 11 or 12 (latest update).
Apple Silicon Macs (via Rosetta 2 & natively on ARM in Standalone or in hosts that support it): macOS 11 or 12 (latest update)

Kontakt Requirements - Windows

Windows 7, Windows 8, or Windows 10 (latest Service Pack, 32/64-bit). Intel Core i5 or equivalent CPU. Graphics hardware support for OpenGL 2.1 or higher. Windows 10 strongly recommended.


Library Walkthrough


Featured Artists & Composers

Kevin Manthei

Kevin Manthei

Angry Birds Mystery Island, Marvel’s Spider-Man, Villainous, Neverwinter, Star Trek Online

"ISW creates some of the most inspiring & realistic guitar sample libraries. I had to write a bunch of really gritty, angry heavy metal & sports action rock cues. I used Shreddage 3 Serpent for leads and was blown away by its onboard processing, programming, and amazing live-sounding leads. I also created a signature sound based on the lead guitar in David Lynch's Twin Peaks series, originally played on baritone guitar. [Serpent] built a convincing replica of that sound just using on-board FX. It was so fun and easy to do!"

Richard Jacques 500px

Richard Jacques

Marvel's Guardians of the Galaxy, Mass Effect, Overwatch 2, James Bond 007: Blood Stone

"I'm a huge fan of the Ventus Winds series. They feature rare instruments deep-sampled to an incredibly high level of detail. It's so liberating to have such a wide range of articulations & phrases that perfectly capture the nuances and performance style of these instruments... from beautiful to haunting, celebratory to sorrowful. Each is expertly recorded and the sound quality is superb, sitting in the mix with ease. If you want to add authentic world winds to your palette, then look no further."

Jeff Broadbent 500px

Jeff Broadbent

Assassin’s Creed Identity, Call of Duty Mobile, Resident Evil, Diablo Immortal, Transformers: Dark of the Moon

"ISW creates amazing, creative, and intuitive virtual instruments! I’ve enjoyed using them for over a decade, and they have found their way into many of my music scores. Their wonderfully realistic world instruments showed up in a recent Nexon video game, Shreddage 3 Stratus on the score for Grid, and Super Audio Boy is a favorite for retro sounds, effects, and fun nostalgia. Highly recommended!"

About the Library

The moment we heard Mattias Krantz’s new experiment — replacing every single hammer on an upright piano with real, metal hammers — we knew we’d found something truly unique that could inspire musicians around the world. It’s not quite like anything you’ve ever heard before. The sound is reminiscent of a particularly powerful and full-voiced harpsichord, with the dynamic responsiveness of a regular piano and the percussive nature of a hammered dulcimer.

While it’s a fun conceptual experiment, we think you’ll find that Hammer Klavier is also beautiful and a delight to play! Mattias worked with us to record his instrument in great depth; it has been carefully sampled to the fullest so that it’s every bit as playable and realistic as a standard piano. We created it with the same love and care that makes our Pearl Concert Grand a staple choice for many composers.

Think of this not as a sound design toolbox but as a custom upright piano with a unique voice. While Mattias might have destroyed a piano to get this great sound, we think you’ll agree it was worth it.

The Engineer Series

Mattias Krantz is a guitarist and YouTuber known for his wild, imaginative experiments with pianos and guitars. We are collaborating with him to bring his unique instruments to composers and musicians around the world. Hammer Klavier is the first instrument in this series, but it won’t be the last!

Console Modular FX Rack & Mixer

Console is a fully-featured mixer, modular effects rack, and pedal board, designed to give you full control over your mix. Effects include multiple EQs (digital and analog-style), compressors, spatial FX, modulation FX, amps, distortion pedals, reverbs, and more.

Each mic channel can be loaded with up to 8 FX in any order, plus another 8 slots on the master channel, with support for send routing as well. The new “Galois Reverb” added in Kontakt 6 Player sounds fantastic as an alternative to our included custom IRs.


Hammer Klavier – Simeon Amburgey

“It is like the boldness and creativity of the sample developers, they’re just going all in and taking us into some very uncharted territory, and unheard territory […] see, it’s just very beautiful, but it can get really crazy too.”

Simeon Amburgey (09/2021)

Hammer Klavier – Synthsonic

“Although it has a unique sound, it seems to be familiar with various songs, so it seems to be highly versatile. The hardness of the real hammers fits in well with EDM-style music; however, because of the crisp acoustic sound, it can be used for any style effectively. It’s perfect for when you want a piano sound that’s a bit different. A gem that seems to reach out when you want a piano but want to choose something a little different.”

Synthsonic (09/2021)