Next GDP-500 classical-piano
New Launch Interactive classical-pianoWelcome to the Accordion-Piano Fusion
The GDP-500 is a revolutionary virtual instrument that combines the warm, breathy tone of an accordion with the familiar layout of a piano keyboard. With unique Attack Envelope control and over 25 professional effects, you can shape your sound from soft, blooming tones to sharp, percussive articulations.
61 Hybrid Keys
Full 5-octave range with authentic accordion samples. Each key is individually sampled for realistic playability.
Attack Envelope (0-800ms)
Control how quickly notes reach full volume - from soft accordion blooms to sharp piano attacks!
25+ Professional Effects
Reverb, delay, chorus, EQ, and more - shape your sound like a professional studio.
Built-in WAV Recorder
Capture your performances with all effects applied, ready for sharing or production.
Understanding the Attack Envelope
How Attack Time Shapes Your Sound
Where t is time from note start, until Attack Time is reached.
The Attack Envelope is the secret to transforming between accordion and piano feels:
Attack Time Examples
0 ms (Zero Attack): Instant sound - sharp, percussive piano attack. Perfect for staccato and rhythmic playing.
200-400 ms (Slow Attack): Gentle swell - like a soft accordion bloom. Ideal for legato melodies and ambient textures.
600-800 ms (Very Slow Attack): Extreme swell - creates ethereal, pad-like sounds. Great for cinematic backgrounds.
Pro Tip: Dynamic Expression
Try automating the Attack Time while playing! Start a phrase with slow attack (200ms) for a soft entrance, then reduce to 0ms for accented notes. This mimics how an accordionist controls bellows pressure!
Getting Started: A Simple Guide
1. Playing the Instrument
You have three ways to play the GDP-500:
- Click or Touch: Simply click on any key with your mouse or tap on touchscreens.
- Computer Keyboard: Use your PC keyboard - each key shows its corresponding letter/number!
- Sustain with Spacebar: Press SPACEBAR to hold notes like a sustain pedal.
| Row | Keys |
|---|---|
| Top Row | Tab Q W E R T Y U I O P [ ] \ |
| Middle Row | A S D F G H J K L ; ' Enter |
| Bottom Row | Z X C V B N M , . / |
2. Core Controls Explained
🔊 VOLUME (0-100%): Controls overall loudness. Start at 85% for comfortable listening.
🎵 PITCH SHIFT (-12 to +12 semitones): Transposes all notes up or down. +1 = one half-step higher.
⚡ PLAYBACK SPEED (0.5x to 2.0x): Changes the sample playback speed. Lower = deeper, slower; Higher = brighter, faster.
🎹 ATTACK TIME (0-800ms): The star feature! Controls how quickly notes reach full volume.
Real-World Example: Creating a French Musette Sound
Set Attack Time to 150ms (soft swell), add Chorus effect (rate 2Hz, depth 3), and play a waltz rhythm. You'll get that classic Parisian cafe accordion sound!
3. The Transpose Feature
Transpose shifts all notes up or down without changing your finger positions. This is perfect for:
- Playing songs in different keys without learning new fingerings
- Matching the pitch of other instruments in a band
- Simplifying difficult key signatures (like playing in C while hearing E♭)
Transpose Formula
Heard Pitch = Played Note + Transpose Value
Example: Press C key + Transpose +2 = You hear a D note!
The Effects Suite Explained
The GDP-500 includes three powerful effects (with more available in the Effects Suite):
Signature Sound Presets
Cathedral Accordion: Reverb mix 60% + Decay 3s + Attack 200ms
Gypsy Jazz: Delay mix 25% + Time 350ms + Attack 0ms + Pitch Shift -2
Ambient Pad: Attack 700ms + Reverb 80% + Chorus depth 4 + Low volume
4. The 10-Band Equalizer (EQ)
The EQ lets you boost or cut specific frequency ranges to shape your tone:
| Frequency | Effect on Sound | Accordion Tip |
|---|---|---|
| 31-125 Hz | Bass / Low end | Boost slightly for warmth |
| 250-500 Hz | Lower mids | Cut to reduce muddiness |
| 1k-4k Hz | Midrange presence | Boost for clarity |
| 8k-16k Hz | Treble / Air | Boost for brightness |
Recording Your Music
5. Using the WAV Recorder
The built-in recorder captures everything you play, including Attack Envelope and all effects!
- [ RECORD ] - Start recording (button turns red, pulses)
- [ STOP ] - Click the same button to stop
- [ PLAY ] - Listen to your recording
- [ SAVE ] - Export as WAV file (simulated in this demo)
Recording Workflow
1. Set your Attack Time and Effects
2. Click RECORD
3. Play your piece
4. Click STOP
5. Click PLAY to review
6. SAVE your masterpiece!
6. Sustain Pedal (🦶 SUSTAIN)
The sustain pedal makes notes continue ringing after you release the key. Press SPACEBAR to toggle!
When to Use Sustain
Ballads: Creates smooth, connected phrases
Chords: Lets harmonies ring together
Arpeggios: Makes broken chords sound like strummed chords
Advanced Techniques
Dynamic Expression with Attack Envelope
The Attack Time control isn't just a setting - it's a performance tool! Try these techniques:
- Volume Swells: Set Attack to 400ms and play chords - they'll bloom like an orchestra swell
- Accented Notes: Use 0ms attack for sharp articulations, then increase for softer passages
- Bellows Effect: Slowly increase Attack Time during a held note to mimic accordion bellows pressure
Learning Resources
Start with simple melodies like "Scarborough Fair" or "Amazing Grace." Use Attack Time at 150ms for a gentle, vocal-like quality. Practice changing Attack Time between phrases!
15 Frequently Asked Questions
The GDP-500 uses accordion samples and features Attack Envelope control, letting you shape from soft blooms to sharp attacks - something impossible on a traditional piano!
Attack Time controls how quickly notes reach full volume. 0ms = instant (piano-like), 200ms+ = slow swell (accordion bloom). Great for expressive playing!
Click anywhere on the page or press any key first - browsers require a "user gesture" to enable audio. Also check your device volume and that samples are loaded (see stats display).
Yes! The GDP-500 is fully touch-responsive. Tap keys to play, pinch to zoom, and use the on-screen controls. Works great on iPads, iPhones, and Android devices.
Pitch Shift changes the audio sample's pitch (like speeding up tape). Transpose changes which MIDI note is triggered. Both affect pitch but in technically different ways - experiment with both!
Click the RESET buttons next to each control. For a complete reset, refresh the page and click to re-enable audio.
Currently, the GDP-500 supports mouse/touch and computer keyboard input. MIDI support is planned for future updates!
61 keys (5 octaves) is the standard for most portable keyboards and covers the full range of accordion music and most popular songs.
Effects process in series: Reverb → Delay → Chorus → EQ → Volume. Each effect modifies the sound from the previous one.
Recordings can be several minutes long depending on browser memory. For best results, keep under 5 minutes.
This can happen when playing many notes at once or using high CPU effects. Try reducing active effects or closing other browser tabs.
Yes! The GDP-500 supports polyphony - hold multiple keys to play chords. Works great for accordion-style left-hand chords!
Each virtual key shows its corresponding computer key in a small label. White keys use letters, black keys use numbers and function keys.
Absolutely! No signup, no credit card, no hidden costs. Just open and play!
Yes! All music you create is yours to use however you like - YouTube, albums, commercials, anything. No royalties required!
Ready to Create Unique Accordion-Piano Sounds?
Launch the GDP-500 below and start exploring the expressive power of Attack Envelope control!
Launch Interactive Instrument