diff --git a/AudioLib.xcodeproj/project.pbxproj b/AudioLib.xcodeproj/project.pbxproj
index cb46864..07be677 100644
--- a/AudioLib.xcodeproj/project.pbxproj
+++ b/AudioLib.xcodeproj/project.pbxproj
@@ -29,6 +29,7 @@
 		422D25F72B896D9A00552952 /* layer3.c in Sources */ = {isa = PBXBuildFile; fileRef = 422D25EC2B896D9A00552952 /* layer3.c */; };
 		422D25FC2B8CE1FA00552952 /* audio_demuxer_mp3.c in Sources */ = {isa = PBXBuildFile; fileRef = 422D25FB2B8CE1FA00552952 /* audio_demuxer_mp3.c */; };
 		422D25FF2B8D2B3600552952 /* audio_sink_file.c in Sources */ = {isa = PBXBuildFile; fileRef = 422D25FE2B8D2B3600552952 /* audio_sink_file.c */; };
+		42919B332B90FAA0001C7187 /* audio_filter_param_eq.c in Sources */ = {isa = PBXBuildFile; fileRef = 42919B322B90FAA0001C7187 /* audio_filter_param_eq.c */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -76,12 +77,9 @@
 		422D25B72B892CF900552952 /* README.md */ = {isa = PBXFileReference; lastKnownFileType = net.daringfireball.markdown; path = README.md; sourceTree = "<group>"; };
 		422D25B82B892E3F00552952 /* resample_neon.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = resample_neon.h; sourceTree = "<group>"; };
 		422D25BA2B892E3F00552952 /* config.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = config.h; sourceTree = "<group>"; };
-		422D25BB2B892E3F00552952 /* fixed_arm5e.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = fixed_arm5e.h; sourceTree = "<group>"; };
 		422D25BC2B892E3F00552952 /* speex_resampler.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = speex_resampler.h; sourceTree = "<group>"; };
-		422D25BD2B892E3F00552952 /* fixed_debug.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = fixed_debug.h; sourceTree = "<group>"; };
 		422D25BE2B892E3F00552952 /* fixed_generic.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = fixed_generic.h; sourceTree = "<group>"; };
 		422D25C02B892E3F00552952 /* resample.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = resample.c; sourceTree = "<group>"; };
-		422D25C22B892E3F00552952 /* fixed_arm4.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = fixed_arm4.h; sourceTree = "<group>"; };
 		422D25C42B89306B00552952 /* os_support.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = os_support.h; sourceTree = "<group>"; };
 		422D25C52B8930B000552952 /* arch.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = arch.h; sourceTree = "<group>"; };
 		422D25C62B8930F200552952 /* speexdsp_types.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = speexdsp_types.h; sourceTree = "<group>"; };
@@ -120,6 +118,8 @@
 		422D25FB2B8CE1FA00552952 /* audio_demuxer_mp3.c */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.c; path = audio_demuxer_mp3.c; sourceTree = "<group>"; };
 		422D25FD2B8D2B3600552952 /* audio_sink_file.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = audio_sink_file.h; sourceTree = "<group>"; };
 		422D25FE2B8D2B3600552952 /* audio_sink_file.c */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.c; path = audio_sink_file.c; sourceTree = "<group>"; };
+		42919B312B90FAA0001C7187 /* audio_filter_param_eq.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = audio_filter_param_eq.h; sourceTree = "<group>"; };
+		42919B322B90FAA0001C7187 /* audio_filter_param_eq.c */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.c; path = audio_filter_param_eq.c; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -178,6 +178,7 @@
 				4207951C2B818C500077507F /* audio_source_testtone.c */,
 				422D25CD2B89668F00552952 /* audio_source_file.c */,
 				422D25C72B8939DF00552952 /* audio_filter_resample.c */,
+				42919B322B90FAA0001C7187 /* audio_filter_param_eq.c */,
 				420795192B8185280077507F /* audio_sink_libao.c */,
 				422D25FE2B8D2B3600552952 /* audio_sink_file.c */,
 				422D25CF2B896B1200552952 /* audio_decoder_mp3.c */,
@@ -197,6 +198,7 @@
 				4207951B2B818C230077507F /* audio_source_testtone.h */,
 				420795042B8184300077507F /* audio_source_file.h */,
 				420795032B8184300077507F /* audio_filter_resample.h */,
+				42919B312B90FAA0001C7187 /* audio_filter_param_eq.h */,
 				420794FF2B8184300077507F /* audio_sink_libao.h */,
 				422D25FD2B8D2B3600552952 /* audio_sink_file.h */,
 			);
@@ -219,9 +221,6 @@
 				422D25C52B8930B000552952 /* arch.h */,
 				422D25C42B89306B00552952 /* os_support.h */,
 				422D25BA2B892E3F00552952 /* config.h */,
-				422D25C22B892E3F00552952 /* fixed_arm4.h */,
-				422D25BB2B892E3F00552952 /* fixed_arm5e.h */,
-				422D25BD2B892E3F00552952 /* fixed_debug.h */,
 				422D25BE2B892E3F00552952 /* fixed_generic.h */,
 				422D25B82B892E3F00552952 /* resample_neon.h */,
 				422D25C02B892E3F00552952 /* resample.c */,
@@ -353,6 +352,7 @@
 				420795182B8184300077507F /* audio.c in Sources */,
 				420794F42B817ECA0077507F /* main.c in Sources */,
 				422D25F42B896D9A00552952 /* synth.c in Sources */,
+				42919B332B90FAA0001C7187 /* audio_filter_param_eq.c in Sources */,
 				422D25F12B896D9A00552952 /* bit.c in Sources */,
 				422D25CA2B89493100552952 /* audio_internal.c in Sources */,
 				422D25C82B8939DF00552952 /* audio_filter_resample.c in Sources */,
@@ -473,6 +473,7 @@
 				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu17;
 				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 3;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
@@ -503,8 +504,10 @@
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
 				GCC_C_LANGUAGE_STANDARD = c99;
+				GCC_OPTIMIZATION_LEVEL = s;
 				HEADER_SEARCH_PATHS = /opt/homebrew/include;
 				LIBRARY_SEARCH_PATHS = /opt/homebrew/lib;
+				ONLY_ACTIVE_ARCH = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Release;
diff --git a/AudioLib.xcodeproj/project.xcworkspace/xcuserdata/dark.xcuserdatad/UserInterfaceState.xcuserstate b/AudioLib.xcodeproj/project.xcworkspace/xcuserdata/dark.xcuserdatad/UserInterfaceState.xcuserstate
index e063bcf..8c2e9f4 100644
Binary files a/AudioLib.xcodeproj/project.xcworkspace/xcuserdata/dark.xcuserdatad/UserInterfaceState.xcuserstate and b/AudioLib.xcodeproj/project.xcworkspace/xcuserdata/dark.xcuserdatad/UserInterfaceState.xcuserstate differ