Changelog — Version 1.5.0 to 1.8.0

Version 1.8.0 — Custom Duration and Compact Interface

Added

• Added a Custom… recording-duration option.
• Added separate numeric fields for:
  • Hours
  • Minutes
  • Seconds
• Custom durations can be combined, for example:
  • 45 seconds
  • 10 minutes
  • 2 hours, 15 minutes, and 30 seconds
• Custom recording duration can be set from 1 second up to thousands of hours.
• Added validation that prevents recording when the custom duration is set to zero.
• The custom duration applies to the complete recording session:
  • WAV and MP3 stop together.
  • WAV and MP3 file rollover does not reset the timer.
  • All active output files are finalized when the duration is reached.
  • The main button returns to Start recording after automatic completion.

Interface improvements

• Redesigned the interface to be smaller and more minimal.
• Reduced the default window size.
• Reduced the minimum window dimensions.
• Reduced the general font size.
• Reduced heading and title sizes.
• Reduced panel padding and spacing.
• Reduced button padding.
• Reduced WAV and MP3 toggle-switch dimensions.
• Shortened labels throughout the interface.
• Removed unnecessary explanatory text from the main window.
• Removed the introductory subtitle.
• Consolidated the time-limit controls into a compact single row.
• Added scrolling for smaller screens and restricted display areas.
• Retained access to every advanced recording option while reducing visual clutter.

Retained

• WASAPI loopback recording
• ASIO input and hardware-loopback recording
• WAV-only, MP3-only, or simultaneous recording
• Separate WAV and MP3 rollover limits
• Recording-duration presets
• Disk-space monitoring
• 256 MiB storage reserve
• Persistent output directory
• One-button Start/Stop operation

Version 1.7.1 — Focusrite ASIO Driver Selection Fix

Improved

• Changed automatic Focusrite driver selection to prefer:

Focusrite USB ASIO
Focusrite Thunderbolt ASIO is no longer automatically preferred simply because it contains the Focusrite name. 

• Focusrite Thunderbolt ASIO remains available for compatible Red and Clarett Thunderbolt hardware.
• Improved handling of systems containing multiple registered Focusrite ASIO drivers.
• The application no longer assumes that every registered ASIO driver has matching hardware currently connected.
• Switching to ASIO mode no longer immediately presents a blocking error when an unavailable driver is encountered.

Improved error reporting

• Replaced the misleading assumption that every ASIO-open failure is caused by another application taking exclusive control.
• Added clearer troubleshooting information for:
  • Incorrect USB or Thunderbolt driver selection
  • Disconnected hardware
  • Obsolete or stale ASIO driver registrations
  • Driver installation problems
  • Sample-rate conflicts
  • Another application already using a single-client ASIO driver
  • Focusrite Control or Focusrite Notifier not detecting the interface

Version 1.7.0 — ASIO and Hardware Loopback Support

Added

• Added a second capture method:

ASIO input pair — hardware or driver loopback

• WASAPI loopback remains available as the default capture method.
• Added installed ASIO driver discovery.
• Added ASIO driver selection.
• Added stereo ASIO input-pair selection.
• Added driver-reported ASIO input-channel names.
• Added automatic preference for channel pairs containing names such as:
  • Loop
  • Loopback
• Added automatic preference for installed Focusrite drivers.
• Added an ASIO Panel button for opening the driver’s native control panel.
• Added active capture-source information to the status display.
• Added selected sample-rate validation against the ASIO driver.
• Recording is prevented when the ASIO driver does not support the selected sample rate.

Focusrite support

• Added support for capturing dedicated Focusrite loopback input channels through the Focusrite ASIO driver.
• The application displays the actual input names and positions reported by the installed driver.
• Loopback positions are not hardcoded because they can vary by:
  • Focusrite model
  • Hardware generation
  • Driver version
  • Sample rate
  • Focusrite Control routing configuration

ASIO recording architecture

• Added a real-time-safe ASIO capture path.
• Audio encoding and disk writing are not performed directly inside the ASIO callback.
• Incoming ASIO data is:
  1. Converted to interleaved 32-bit floating-point audio.
  2. Copied into pooled memory.
  3. Sent through a bounded asynchronous queue.
  4. Written and encoded by a separate processing task.
• This reduces the risk that MP3 encoding or slow storage blocks the ASIO driver callback.
• Added a specific queue-overflow error when the computer cannot process ASIO data quickly enough.
• ASIO timeline handling remains continuously clocked and does not use WASAPI silent-gap insertion.

Capture-method guidance

• WASAPI remains suitable for:
  • General Windows system-audio capture
  • Devices without dedicated loopback channels
  • Situations where the ASIO driver is already occupied
  • Interfaces whose loopback routing is unavailable or unconfigured
• ASIO is suitable for:
  • Dedicated interface loopback channels
  • Direct hardware or driver input pairs
  • Focusrite loopback routing
  • Recording through the interface’s native ASIO driver

Version 1.6.0 — Continuous File Rollover and Separate Size Limits

Continuous WAV rollover

• Replaced the previous WAV 4 GiB recording stop with automatic file rollover.
• Reaching the standard RIFF WAV size ceiling no longer ends the recording.
• When the WAV file limit is reached, the application:
  1. Finalizes the current WAV file.
  2. Creates a new numbered WAV part.
  3. Continues recording from the next audio frame.
  4. Keeps MP3 recording active without interruption.

Example:

Loopback_2026-07-15_12-00-00.wav Loopback_2026-07-15_12-00-00_part002.wav Loopback_2026-07-15_12-00-00_part003.wav
WAV rollover is treated as normal operation rather than an error. 

• The recording timer continues across all WAV parts.
• WAV rollover does not restart or interrupt the MP3 encoder.

Separate WAV file-size limit

Added independently selectable WAV part limits:

• 512 MiB
• 1 GiB
• 2 GiB
• 3 GiB
• Maximum safe standard-WAV size, approximately 3.99 GiB — default

Each WAV part is finalized before the selected limit is exceeded.

Separate MP3 file-size limit

Added independently selectable MP3 part limits:

• No MP3 file-size limit — default
• 256 MiB
• 512 MiB
• 1 GiB
• 2 GiB
• 4 GiB
• 8 GiB

When an MP3 file-size limit is selected, the recorder creates additional numbered MP3 files:

Loopback_2026-07-15_12-00-00.mp3 Loopback_2026-07-15_12-00-00_part002.mp3 Loopback_2026-07-15_12-00-00_part003.mp3
MP3 rollover does not stop WAV recording or reset the session timer.
Time-limit behavior
The recording time limit continues to control the complete recording session. 
WAV and MP3 stop together when the selected duration is reached. 
File-size rollover does not reset or extend the selected recording duration. 
All active WAV and MP3 parts are finalized normally when the session ends. 
Disk-space protection
Reduced the protected free-space reserve from 512 MiB to 
Remaining recording-time estimates now use total usable disk capacity rather than treating the WAV 4 GiB ceiling as the end of the session. 
Recording continues through WAV and MP3 rollover until: 

• • The user presses Stop.
  • The selected time limit is reached.
  • The drive approaches the 256 MiB reserve.
  • A genuine recording, device, or file-writing error occurs.

Version 1.5.0 — Timed Recording and Improved Explorer Behavior

Added recording time limits

• Added a Recording time limit selector.
• Default setting:

No time limit

• Added preset recording durations:
  • 1 minute
  • 5 minutes
  • 10 minutes
  • 15 minutes
  • 30 minutes
  • 45 minutes
  • 1 hour
  • 2 hours
  • 3 hours
  • 4 hours
  • 5 hours
  • 5 hours and 30 minutes
  • 6 hours
  • 8 hours
  • 10 hours
  • 12 hours
  • 24 hours
• Added a live countdown when a fixed duration is selected.
• Recording stops automatically when the selected duration is reached.
• WAV, MP3, or both active outputs are finalized normally.
• The main toggle returns to Start recording after automatic completion.
• The selected duration remains active so another recording can be started manually.

Storage validation

• Added pre-recording validation for selected recording durations.
• The application estimates whether the selected recording can fit within:
  • Available drive space
  • The configured safety reserve
  • The WAV-format capacity available at that time
• Unsafe recording durations are rejected before output files are created.

Explorer-window behavior

• Changed the recording-folder behavior to a one-time reveal.
• The selected output folder is shown at most once per application run for each output directory.
• After the folder has been shown:
  • A minimized Explorer window remains minimized.
  • The application does not restore or bring it to the foreground.
  • The application does not repeatedly create additional windows for the same folder.
  • A visible matching folder window may update its selected file without stealing focus.
  • If the folder is closed, it is not reopened automatically during the same run.
• Updated the option label to:

Show recording folder once after stopping

Versioned executable naming

• Changed the public executable naming scheme to include the full application name and version.

Example:

Loopback Recorder - WAV + MP3 V1.5.0.exe

• Updated:
  • Publishing scripts
  • Local installation scripts
  • Start Menu shortcuts
  • Installer configuration
  • Uninstaller icon references
  • Assembly metadata
  • Application manifest

Summary of Major Changes Since Version 1.5

Versions 1.5 through 1.8 introduced:

• Preset and custom recording-duration controls
• Automatic timed stopping
• A compact hours, minutes, and seconds editor
• Continuous WAV recording through automatic numbered file rollover
• Optional MP3 file rollover
• Separate WAV and MP3 file-size limits
• A reduced 256 MiB disk-space reserve
• ASIO input and hardware-loopback capture
• Focusrite loopback support
• Improved Focusrite USB and Thunderbolt driver selection
• More accurate ASIO troubleshooting
• A real-time-safe asynchronous ASIO processing pipeline
• Improved one-time Explorer-folder behavior
• Versioned public executable names
• A substantially smaller and cleaner user interface