diff --git a/firmware/application/apps/ui_level.cpp b/firmware/application/apps/ui_level.cpp
index 0a3e8fa20..3a1bbec92 100644
--- a/firmware/application/apps/ui_level.cpp
+++ b/firmware/application/apps/ui_level.cpp
@@ -24,7 +24,9 @@
 #include "ui_level.hpp"
 #include "ui_fileman.hpp"
 #include "ui_freqman.hpp"
+#include "baseband_api.hpp"
 #include "file.hpp"
+#include "oversample.hpp"
 
 using namespace portapack;
 using namespace tonekey;
@@ -174,48 +176,52 @@ size_t LevelView::change_mode(freqman_index_t new_mod) {
     switch (new_mod) {
         case AM_MODULATION:
             freqman_set_bandwidth_option(new_mod, field_bw);
-            // bw DSB (0) default
-            field_bw.set_by_value(0);
             baseband::run_image(portapack::spi_flash::image_tag_am_audio);
             receiver_model.set_modulation(ReceiverModel::Mode::AMAudio);
             receiver_model.set_am_configuration(field_bw.selected_index_value());
             field_bw.on_change = [this](size_t, OptionsField::value_t n) { receiver_model.set_am_configuration(n); };
+            // bw DSB (0) default
+            field_bw.set_by_value(0);
             text_ctcss.set("             ");
             break;
         case NFM_MODULATION:
             freqman_set_bandwidth_option(new_mod, field_bw);
-            // bw 16k (2) default
-            field_bw.set_by_value(2);
             baseband::run_image(portapack::spi_flash::image_tag_nfm_audio);
             receiver_model.set_modulation(ReceiverModel::Mode::NarrowbandFMAudio);
             receiver_model.set_nbfm_configuration(field_bw.selected_index_value());
             field_bw.on_change = [this](size_t, OptionsField::value_t n) { receiver_model.set_nbfm_configuration(n); };
+            // bw 16k (2) default
+            field_bw.set_by_value(2);
             break;
         case WFM_MODULATION:
             freqman_set_bandwidth_option(new_mod, field_bw);
-            // bw 200k (0) only/default
-            field_bw.set_by_value(0);
             baseband::run_image(portapack::spi_flash::image_tag_wfm_audio);
             receiver_model.set_modulation(ReceiverModel::Mode::WidebandFMAudio);
             receiver_model.set_wfm_configuration(field_bw.selected_index_value());
             field_bw.on_change = [this](size_t, OptionsField::value_t n) { receiver_model.set_wfm_configuration(n); };
+            // bw 200k (0) only/default
+            field_bw.set_by_value(0);
             text_ctcss.set("             ");
             break;
         case SPEC_MODULATION:
             freqman_set_bandwidth_option(new_mod, field_bw);
             baseband::run_image(portapack::spi_flash::image_tag_capture);
             receiver_model.set_modulation(ReceiverModel::Mode::Capture);
-            field_bw.set_by_value(0);
             field_bw.on_change = [this](size_t, OptionsField::value_t sampling_rate) {
-                auto anti_alias_baseband_bandwidth_filter = filter_bandwidth_for_sampling_rate(sampling_rate);
-                receiver_model.set_sampling_rate(sampling_rate);
-                receiver_model.set_baseband_bandwidth(anti_alias_baseband_bandwidth_filter);
+                // Baseband needs to know the desired sampling and oversampling rates.
+                baseband::set_sample_rate(sampling_rate, get_oversample_rate(sampling_rate));
+
+                // The radio needs to know the effective sampling rate.
+                auto actual_sampling_rate = get_actual_sample_rate(sampling_rate);
+                receiver_model.set_sampling_rate(actual_sampling_rate);
+                receiver_model.set_baseband_bandwidth(filter_bandwidth_for_sampling_rate(actual_sampling_rate));
             };
+            field_bw.set_by_value(0);
         default:
             break;
     }
     if (new_mod != SPEC_MODULATION) {
-        // reset receiver model to fix bug when going from SPEC to audio, the sound is distorded
+        // Reset receiver model to fix bug when going from SPEC to audio, the sound is distorted.
         receiver_model.set_sampling_rate(3072000);
         receiver_model.set_baseband_bandwidth(1750000);
     }
diff --git a/firmware/application/apps/ui_recon.cpp b/firmware/application/apps/ui_recon.cpp
index c2d3e4f9d..4df0698d9 100644
--- a/firmware/application/apps/ui_recon.cpp
+++ b/firmware/application/apps/ui_recon.cpp
@@ -1124,48 +1124,50 @@ size_t ReconView::change_mode(freqman_index_t new_mod) {
     switch (new_mod) {
         case AM_MODULATION:
             freqman_set_bandwidth_option(new_mod, field_bw);
-            // bw DSB (0) default
-            field_bw.set_by_value(0);
             baseband::run_image(portapack::spi_flash::image_tag_am_audio);
             receiver_model.set_modulation(ReceiverModel::Mode::AMAudio);
             receiver_model.set_am_configuration(field_bw.selected_index_value());
             field_bw.on_change = [this](size_t, OptionsField::value_t n) { receiver_model.set_am_configuration(n); };
+            // bw DSB (0) default
+            field_bw.set_by_value(0);
             text_ctcss.set("        ");
             recording_sampling_rate = 12000;
             break;
         case NFM_MODULATION:
             freqman_set_bandwidth_option(new_mod, field_bw);
-            // bw 16k (2) default
-            field_bw.set_by_value(2);
             baseband::run_image(portapack::spi_flash::image_tag_nfm_audio);
             receiver_model.set_modulation(ReceiverModel::Mode::NarrowbandFMAudio);
             receiver_model.set_nbfm_configuration(field_bw.selected_index_value());
             field_bw.on_change = [this](size_t, OptionsField::value_t n) { receiver_model.set_nbfm_configuration(n); };
+            // bw 16k (2) default
+            field_bw.set_by_value(2);
             recording_sampling_rate = 24000;
             break;
         case WFM_MODULATION:
             freqman_set_bandwidth_option(new_mod, field_bw);
-            // bw 200k (0) default
-            field_bw.set_by_value(0);
             baseband::run_image(portapack::spi_flash::image_tag_wfm_audio);
             receiver_model.set_modulation(ReceiverModel::Mode::WidebandFMAudio);
             receiver_model.set_wfm_configuration(field_bw.selected_index_value());
             field_bw.on_change = [this](size_t, OptionsField::value_t n) { receiver_model.set_wfm_configuration(n); };
+            // bw 200k (0) default
+            field_bw.set_by_value(0);
             text_ctcss.set("        ");
             recording_sampling_rate = 48000;
             break;
         case SPEC_MODULATION:
             freqman_set_bandwidth_option(new_mod, field_bw);
-            // bw 12k5 (0) default
-            field_bw.set_by_value(0);
             baseband::run_image(portapack::spi_flash::image_tag_capture);
             receiver_model.set_modulation(ReceiverModel::Mode::Capture);
             field_bw.on_change = [this](size_t, OptionsField::value_t sampling_rate) {
-                auto anti_alias_baseband_bandwidth_filter = filter_bandwidth_for_sampling_rate(sampling_rate);
-                record_view->set_sampling_rate(sampling_rate);
-                receiver_model.set_sampling_rate(sampling_rate);
-                receiver_model.set_baseband_bandwidth(anti_alias_baseband_bandwidth_filter);
+                // record_view determines the correct oversampling to apply and returns the actual sample rate.
+                auto actual_sampling_rate = record_view->set_sampling_rate(sampling_rate);
+
+                // The radio needs to know the effective sampling rate.
+                receiver_model.set_sampling_rate(actual_sampling_rate);
+                receiver_model.set_baseband_bandwidth(filter_bandwidth_for_sampling_rate(actual_sampling_rate));
             };
+            // bw 12k5 (0) default
+            field_bw.set_by_value(0);
             text_ctcss.set("        ");
             break;
         default:
@@ -1173,7 +1175,6 @@ size_t ReconView::change_mode(freqman_index_t new_mod) {
     }
     if (new_mod != SPEC_MODULATION) {
         button_audio_app.set_text("AUDIO");
-        // TODO: Oversampling.
         record_view->set_sampling_rate(recording_sampling_rate);
         // reset receiver model to fix bug when going from SPEC to audio, the sound is distorted
         receiver_model.set_sampling_rate(3072000);
diff --git a/firmware/application/ui/ui_spectrum.cpp b/firmware/application/ui/ui_spectrum.cpp
index 52c06839d..1ee2f7344 100644
--- a/firmware/application/ui/ui_spectrum.cpp
+++ b/firmware/application/ui/ui_spectrum.cpp
@@ -380,10 +380,10 @@ void WaterfallView::on_audio_spectrum() {
 
 } /* namespace spectrum */
 
-// TODO: Comments below refer to a fixed oversample rate (8x), cleanup.
 uint32_t filter_bandwidth_for_sampling_rate(int32_t sampling_rate) {
     switch (sampling_rate) {   // Use the var fs (sampling_rate) to set up BPF aprox < fs_max / 2 by Nyquist theorem.
-        case 0 ... 3'500'000:  // BW Captured range (0 <= 250kHz max) fs = 8x250k = 2000, 16x150k = 2400, 32x100k = 3200, 32x75k = 2400, (future 64x40 khz = 2400)
+        case 0 ... 3'500'000:  // BW Captured range BW (<=250K) : fs = 8x250k = 2000k, 16x150k = 2400k, 16x100k=1600k,
+                               // 32x75k = 2400k, 32x50k=1600, 32x32k=1024, 64x25k = 1600k, 64x16k = 1024k, 64x12k5 = 800k.
             return 1'750'000;  // Minimum BPF MAX2837 for all those lower BW options.
 
         case 4'000'000 ... 7'000'000:  // OVS x8, BW capture range (500k...750kHz max) fs_max = 8 x 750k = 6Mhz