# Pex SDK - Release Notes

<details>

<summary>Version 4.6.1</summary>

* **Enhanced Cover Song Detection**
  * Melody lookups can now include an additional **phonetic fingerprint** in the same request.
  * Detection can identify matches based on either melody or phonetic similarity to assets in the Pex registry.
  * More details can be found at [search-types-and-use-cases](../faq/search-types-and-use-cases "mention")
* **Content Classification**
  * Analyze a query file to detect if it contains any **music**, **speech**, and/or **silence** segments.
  * Can be combined with an audio lookup to identify music content that contain no matches to any commercial tracks in the Pex registry
  * More details can be found at [content-classification](../faq/content-classification "mention")
* **Melody Matching Improvements**
  * Optimizations to the melody matching (approximately 35% higher true positive rate)

In order to access these new features, update your language bindings to the 4.6.1 release. Please see [language-bindings](../sdk-integration/getting-started/language-bindings "mention")for more details.

</details>

<details>

<summary>Version 4.5.0</summary>

This version includes internal updates to prepare for upcoming new features

</details>

<details>

<summary>Version 4.4.0</summary>

* Archive Functionality (for Search: Custom Database clients) - allows client to remove a fingerprint from their custom database, so it will no longer be available for matching. For more details on using this functionality, please visit [basic-usage](../sdk-integration/search-custom-database/basic-usage "mention")
* Database List Functionality (for Search: Custom Database clients) - allows client to retrieve a list of what fingerprints (via provided\_id) are currently in their custom database. For more details on using this functionality, please visit [basic-usage](../sdk-integration/search-custom-database/basic-usage "mention")
* Improvements made to the "Identify Music" search type for audio matching for DJ mixes, mashups, and long compilations.
* Better Logging Information - Additional information added to the logs to assist with troubleshooting issues
* Bug Fix: Fix for SDK occasionally erroring out after long period of connectivity with no activity

In order to access these new features, update your language bindings to the 4.4.0 release. Please see [language-bindings](../sdk-integration/getting-started/language-bindings "mention")for more details.

</details>

<details>

<summary>Version 4.2.1 </summary>

* A `confidence` value is now returned for every match segment in the search response. You can find it in the `segments` object in the `match_details` section.

- For more details, visit the **Search Response** page for [Search: Pex Registry](../sdk-integration/search-pex-registry/search-response) or [Search: Custom Database](../sdk-integration/search-custom-database)

* Bug Fix: The SDK will no longer return an invalid input error when attempting to create an audio fingerprint from a file that contains no or low level audio&#x20;

</details>

<details>

<summary>Version 4.1.2</summary>

* When performing an audio or melody search against the Pex Registry, you can now also designate a specific **search type** to perform: an "identify music" search or a "find matches" search. A `identify music` search allows you to check any media file for copyrighted music. A `find matches` search allows you to find commercially distributed versions of your own copyrighted asset. To designate a search type, you will pass an additional parameter when creating the search request. Note: if no search type is designated, the search will default to the "identify music" search type.

- For more details on how to prepare the search request and designate a search type, visit: [#initiate-search](../../sdk-integration/search-pex-registry/basic-usage#initiate-search "mention")

* For more details on the two search types, visit: [search-types-and-use-cases](../faq/search-types-and-use-cases "mention")

In order to access these new features, update your language bindings to the 4.1.2 release. Please see [language-bindings](../sdk-integration/getting-started/language-bindings "mention")for more details.

</details>

<details>

<summary>Version 4.0.10</summary>

* When searching against the Pex Registry, DSP links (if available) are now returned for matched assets in the search response. You can find it in the `dsp` object in the `asset` section.

- For more details, visit the **Search Response** page for [Search: Pex Registry](../sdk-integration/search-pex-registry/search-response)

</details>

<details>

<summary>Version 4.0.3</summary>

* When searching against the Pex Registry, the release date is now returned for the album associated with the matched asset. You can find it in the `release_date` object in the `asset` section.

- For more details, visit the **Search Response** page for [Search: Pex Registry](../sdk-integration/search-pex-registry/search-response)

</details>

<details>

<summary>Version 4.0.0</summary>

* The search response has been expanded to include more asset metadata and match details for a matched asset.
  * Asset metadata now includes: ISRC, Title, Subtitle, Artist, Album/Release Name, Barcode, Label, Distributor
  * Match details now includes: Query Match Duration, Query Match %, Asset Match Duration, Asset Match %
  * Match segment details now includes: Query Start, Query End, Asset Start, Asset End, Pitch Modification, Speed Modification, Transposition information

- For more details, visit the **Search Response** page for [Search: Pex Registry](../sdk-integration/search-pex-registry/search-response) or [Search: Custom Database](../sdk-integration/search-custom-database)

</details>
