This version fixes an issue where the playback volume was low, making faint sounds difficult to hear. Adjustments have also been made to better align the measured values ​​with those obtained using a sound level meter.

To prevent overrange during loud sound measurements when using an external microphone, the attenuate button has been expanded to two levels: -12 dB and -30 dB. This has widened the range of measurable sound pressure.

In this version, recorded sound can be played repeatedly and stopped at any point. The analysis window width on the spectrum analysis screen can now be expanded or contracted.

In this version, 1. Spectrogram image display has been speeded up. 2. Improved file sharing and deletion user interface 3. Flattened the gain characteristics of IIR filters (LPF, HPF) in the passband. 4. Also added the function of FFT filter 5. Corrected inaccuracies in cepstrum analysis and added spectral envelope display

1) Improved to detect and display overrange during sound recording. 2) In environments where it is possible to change the microphone input gain, such as an external microphone or an iPad, a new button to reduce the gain by 12dB will appear. 3) Added analysis function of time domain waveform. - You can set the cutoff frequency and the order of the low pass filter and high pass filter. This filter is also reflected in the playback of the sound, so you can, for example, remove the low frequencies and hear the desired high frequency sounds. - Envelopes can be generated by Hilbert transform. - Added pulse counter function.

This version adds a new settings screen that allows you to change the colormap and frequency range. We also fixed some bugs.

1. Displays the peak frequency (the peak within the upper 75% of the frequency display range) in addition to the sound pressure level in real time spectrogram. 2. Improved resolution of spectrogram screen (for display below 2kHz). 3. Added comment editing function.

Minor changes. 1. The default setting has been changed to make the spectrogram image clearer. 2. The sound pressure level display on the recording screen has been modified so that the same value is displayed for both the external microphone (SONY ECMSP10) and the built-in microphone. 3. On the analysis screen, the program has been modified so that the frequency range can be changed more smoothly by swiping.