Multiple Tone Generator vs Songmark

This app generates the audio signal of multiple channels. Supports 6 audio channels by default, upgradeable to 16 via in-app purchase. [ Wave type ] - There are four types of waveform. (Sine, Triangle, Squire, Saw) - It can switch to the four types of each waveform by the wave type button. - It can be set for each channel. - It can change summarizes the waveforms of all channels with the bottom of the button. [ Volume ] - It can adjust the volume of each channel (Input) and change the mixer (Output) of all channels by the volume slider. - It can be set OFF / ON the volume of each channel by mute button. [ Frequency ] - It can set the value of the frequency in 20Hz - 20000Hz. - It can set the frequency value in the software keyboard by tapping the frequency label. - It can set the frequency value at the corresponding slider to the logarithm. - It can set the frequency value of -1 / + 1 octave from the current value by -1/+1 Octave button. - It can adjust the frequency value slightly from the current value by -/+ button. [ Preset ] - It can set the frequency value of Guitar (E A D G B E), 6-string bass (B E A D G C) for Ch 1 ~ 6. Guitar : Ch 1: E ( 82.4 Hz) Ch 2: A (110.0 Hz) Ch 3: D (146.8 Hz) Ch 4: G (196.0 Hz) Ch 5: B (246.9 Hz) Ch 6: E (329.6 Hz) 6-string bass (+ 1 octave) : Ch 1: B ( 61.7 Hz) Ch 2: E ( 82.4 Hz) Ch 3: A (110.0 Hz) Ch 4: D (146.8 Hz) Ch 5: G (196.0 Hz) Ch 6: C (262.0 Hz)

Songmark turns your listening history into a personal map of everywhere you've ever heard music. Every time a song plays for 30, Songmark drops a pin at your exact location — silently, automatically, in the background. Over time your map becomes a record of your life: the commutes, the trips, the random Tuesday walks, the concerts, the moments you'll never forget. What Songmark does • Pins every song you listen to on Apple Music to the exact place you heard it • Works in the background — no tapping required • Browse your pins on a map or scroll through your listening logs by day • Search your entire history by song, artist, or album • See every place you've ever heard a specific song • Add notes and photos to any memory • Export any day or trip as an Apple Music playlist Your music. Your map. Songmark is a journal you never have to write. Every pin is a moment — a city you visited, a place you loved, a song that hit differently because of where you were standing when you heard it. Privacy first Your exact location data lives on your device and is never shared, sold, or used for tracking. Songmark has no ads and no interest in your data. Requires Apple Music. Background tracking requires "Always" location permission.