WhichScale

【Sign-in screen】　Initial Screen You can sign up or sign in using your user ID and password, or your Apple, Google, or Facebook account. Unless you sign out manually, you'll be signed in and ready to use the app the next time you launch it.

【Sheet Management】 You can create new sheet music files or import existing ones. You can import from iRealPro and MuseScore, or import photos from your camera or photo library. Please register the chord progressions from your own sheet music for use. The system does not provide any songs; users must register them themselves. The song analysis results are saved to the cloud. You can immediately download and view the analyzed songs. Saved songs will be displayed in a list in the Navigator. You can install the app on up to three devices; as long as you sign in with the same user ID, your music will be available on all of them.

【Score Display Screen】 When you import the chord progressions for each song, the system analyzes and color-codes the partial modulations and positions of each chord, and suggests cadences and scales.

Imported chord progressions are color-coded by position to indicate interval notation, cadence function, scale options, and other factors. The four-note progression is analyzed and marked. When an implicit modulation is detected in the score, the destination key is displayed and highlighted in a different color. Suggested scales for each chord are provided. Depending on the code, there may be multiple options available, and those will also be displayed.

You can view the explanation for each code by double-tapping it, and an audio summary will be read aloud.

You can play chords and scales for each chord. You can view the explanation for each chord and tap it to hear the sound. Tap the chord name displayed in the center of the fretboard or keyboard to hear the selected chord. You can use the arrow buttons to manually move left and right while playing the audio. Tap the delta Play button in the lower-right corner to automatically play the entire song in sequence. You can also select a portion of the track by pressing the arrow button to specify a range and play it on repeat.

When there are multiple scale options, you can select the one you want for each chord in the explanation window, and the playback will follow your selection. During playback, you can display chord and scale fingerings on diagrams of guitar and bass fingerboards or piano keyboards. You can enlarge the sheet music for the section currently playing at the bottom.

To play a scale, you can display and play it using preset arpeggios or custom interval patterns. You can add, edit, and delete custom frequency patterns in the center of the settings screen. Since you can specify the sound (phrase) for each chord using musical notes, you can also enter a melody and play it back. When editing phrases, you can view the chords and scale notes at the selected position, which helps you create practice sheets that incorporate chords and scales. Since you can switch between patterns and phrases while viewing and playing them, you can practice song melodies, arpeggios, scales, and improvisation sequentially with the song.

Tap a song title to change its settings. You can edit the displayed title, select a font, and transpose the key. With the exception of imported songs, you can edit measures and chords.

You can export the displayed sheet music to a PDF file. This is useful when printing it on paper.

Using the controller at the bottom, you can adjust the display mode for explanations, the zoomed-in score view, the fretboard and keyboard displays, the mixer, the metronome, the range selection, the intro, the number of plays, the arpeggio selection, the swing setting, the playback pattern, and the playback speed.