iPad Screenshots



HDS iSound is a hiqhquality virtual soundmodule for your iPad. Play your iPad with external MIDI instruments, accordion-MIDI, soundenlargement for your stage-setup or as stand-alone for training and learning at home.
Using the sample-library of HDS Pro.Sound1 and HDS Sound.Power offers HDS iSound a very realistic and authentic sound reproduction. By real-time streaming the audio samples can be played in very high polyphony and low latency of only 5ms.


- Accordion folkmusic
- Styrian button-Box (diatonic)
- Oberkrainer-Guitar / GitChordSamples for accompainment
with Major / Minor / Sept. / Deminished-chords*
- Baritone short/long**
- Baritone
- Gaudi-Sample SET

more available sound variations and sound packs as In-App purchases :

Accordion-Pack*, Styrian-ButtonBox-Pack*, GitChord-Pack*, Baritone2, Bass-Pack, Trumpet/Clarinet-Pack, Stubnmusi-Pack, DrumSet-Pack

*for using GitChordSamples, GitChordPack, Accordion- and StyrianPack with MIDI-accordion (bass-side), make sure that your MIDI-system includes the SampleChannel-Option.
**switch with SoftPedal – Midicontroller CC 67


- record with the built-in MIDI Recorder and save and upload
your songs in Standard MIDI file format
- unlimited number of tracks
- 16 separate MIDI channels, assignable individually
for each track
- unlimited recording and playback time
- load SMF MIDI files to your device using the iTunes software
- use Midi Files in the app and you will see on
the virtual keyboard which notes are played
- use the unique "Tempo-Zoom" slider to, i.e. for slowing
down songs in order to learn them easier


- Polyphony depending on used iPad-model up
to 120 stereo voices
- configurable audio latency down to 5ms
- built-in DSP effects with 17 presets
- RunApp in background, so you can play and at the same
time, for example, with another app, show sheets
or lyrics or play back MP3s
- supports Apple 's "inter - app audio " system (iOS7) for
audio & MIDI streaming to / from other apps
- supports " JACK Audio Connection Kit " (up to iOS 6.1.3)
for audio & MIDI streaming to / from other apps.
- supports Audio Unit (iOS 9.3)


For good performance we recommend iPad4 and later.

Please note that this app requires a lot of hardware resources.
If you encounter problems with the app, please close all running applications in the background by pressing twice on the "Home" button and in the list of displayed apps hold onto a tap and - then press the "minus sign" in the corner, to close this application. Then close all other apps.

For more information on compatible MIDI adapter, please visit the website www.hdsmusic.de or ask your music retailer.

What’s New

Version 1.9

• Introduces completely redesigned sound selection, now in full screen!
• Introduces intuitive and fast sound search filters.
• Switch directly between sound sets by tapping on its icon from the sound sets overview screen.
• AudioUnit plugin: Fixed several problems with third-party AU host apps.
• Fixed crash when overwriting existing performance preset.
• Fixed volume knob not being updated on CC #7.
• Fixed effect send knob not being updated on CC #91.
• Added "panic" button.
• Audio Unit: Fixed wrong preset being restored under certain conditions.
• Audio Unit: loads instruments in background again on regular real-time DAW usage.
• Fixed memory leaks.
• MIDI Recorder: added setting to ignore MIDI program change on playback (default is ignore now).
• Performance Presets: Fixed transpose setting not being restored.
• MIDI Recorder: Sort songs alphabetically.
• Added launch screen images.

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

Thiensun88 ,

Dot not buy this

Expensive but qualify sounds, you can preset the accordion you want and recall it when you need,(just turn on playing back ground and play it on midi accordion you have on iPad )ex: you can preset one accordion with mussette treble, trumpet chords, and Ebass, etc...you can watch video ''dan phong cam the key 21'' on YouTube to hear the sounds

Critic313 ,

Not ready for performance

It is very hard to control the volumes of each part. I couldn't get enough volume out of the bass part with bellows dynamics of my midi accordion. If I turn off expression in my accordion, then the treble is too loud. It seems that you have to adjust the volume of each part every time you start the app as you can't really save your settings. The accordion sound is quite good, but very little choice for the price. I didn't care for the guitar at all. Some other guitar sounds are available for purchase. Then again, the whole thing becomes too expensive.

ngwaltne ,

Amazing Oberkrainer Sounds

I have been playing polka music focusing on the Oberkrainer sound for years. Finally this app provides the sounds for a solo player or a small band. The baritone is aggressive and has that pop. Bought the bass guitar sounds and they are awesome too. The main issue I have is that my accordion chords activate three notes to play a chord. The HDS app bases the chord on 1 note and is a sample. The sound is fantastic but when I play a C I get a C, E, and G together. The manufacturer of my midi is not responding to my questions. Updating a midi accordion is an expensive process. Anyway great app for what it does. Check out Turboreini on YouTube for detailed vids.


Franz Schmid, Sandi Jug
303.8 MB

Requires iOS 9.3 or later. Compatible with iPad.


English, German

Age Rating
Rated 4+
© 2014-2019 HDSmusic (Sounds), © 2014-2019 Crudebyte (Software & Graphics)
In-App Purchases
  1. Bass Sound Pack $49.99
  2. Baritone 2 Sound-Pack $19.99
  3. Trumpet-Clarinet Pack $44.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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